A Systematic Review and Meta-Analysis of Practices Exposing Humans to Avian Influenza Viruses, Their Prevalence, and Rationale
Identifieur interne : 000898 ( Pmc/Corpus ); précédent : 000897; suivant : 000899A Systematic Review and Meta-Analysis of Practices Exposing Humans to Avian Influenza Viruses, Their Prevalence, and Rationale
Auteurs : Guillaume Fournié ; Erling H G ; Tony Barnett ; Dirk U. Pfeiffer ; Punam MangtaniSource :
- The American Journal of Tropical Medicine and Hygiene [ 0002-9637 ] ; 2017.
Abstract
Almost all human infections by avian influenza viruses (AIVs) are transmitted from poultry. A systematic review was conducted to identify practices associated with human infections, their prevalence, and rationale. Observational studies were identified through database searches. Meta-analysis produced combined odds ratio estimates. The prevalence of practices and rationales for their adoptions were reported. Of the 48,217 records initially identified, 65 articles were included. Direct and indirect exposures to poultry were associated with infection for all investigated viral subtypes and settings. For the most frequently reported practices, association with infection seemed stronger in markets than households, for sick and dead than healthy poultry, and for H7N9 than H5N1. Practices were often described in general terms and their frequency and intensity of contact were not provided. The prevalence of practices was highly variable across studies, and no studies comprehensively explored reasons behind the adoption of practices. Combining epidemiological and targeted anthropological studies would increase the spectrum and detail of practices that could be investigated and should aim to provide insights into the rationale(s) for their existence. A better understanding of these rationales may help to design more realistic and acceptable preventive public health measures and messages.
Url:
DOI: 10.4269/ajtmh.17-0014
PubMed: 28749769
PubMed Central: 5544094
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PMC:5544094Le document en format XML
<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">A Systematic Review and Meta-Analysis of Practices Exposing Humans to Avian Influenza Viruses, Their Prevalence, and Rationale</title><author><name sortKey="Fournie, Guillaume" sort="Fournie, Guillaume" uniqKey="Fournie G" first="Guillaume" last="Fournié">Guillaume Fournié</name><affiliation><nlm:aff id="aff1">Veterinary Epidemiology, Economics and Public Health Group, Department of Pathobiology and Population Sciences, Royal Veterinary College, Hatfield, United Kingdom</nlm:aff></affiliation></author><author><name sortKey="H G, Erling" sort="H G, Erling" uniqKey="H G E" first="Erling" last="H G">Erling H G</name><affiliation><nlm:aff id="aff2">Department of Global Health and Development, London School of Hygiene and Tropical Medicine, London, United Kingdom</nlm:aff></affiliation></author><author><name sortKey="Barnett, Tony" sort="Barnett, Tony" uniqKey="Barnett T" first="Tony" last="Barnett">Tony Barnett</name><affiliation><nlm:aff id="aff2">Department of Global Health and Development, London School of Hygiene and Tropical Medicine, London, United Kingdom</nlm:aff></affiliation></author><author><name sortKey="Pfeiffer, Dirk U" sort="Pfeiffer, Dirk U" uniqKey="Pfeiffer D" first="Dirk U." last="Pfeiffer">Dirk U. Pfeiffer</name><affiliation><nlm:aff id="aff1">Veterinary Epidemiology, Economics and Public Health Group, Department of Pathobiology and Population Sciences, Royal Veterinary College, Hatfield, United Kingdom</nlm:aff></affiliation><affiliation><nlm:aff id="aff3">School of Veterinary Medicine, City University of Hong Kong, Kowloon, Hong Kong</nlm:aff></affiliation></author><author><name sortKey="Mangtani, Punam" sort="Mangtani, Punam" uniqKey="Mangtani P" first="Punam" last="Mangtani">Punam Mangtani</name><affiliation><nlm:aff id="aff4">Department of Infectious Disease Epidemiology, London School of Hygiene and Tropical Medicine, London, United Kingdom</nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">28749769</idno><idno type="pmc">5544094</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5544094</idno><idno type="RBID">PMC:5544094</idno><idno type="doi">10.4269/ajtmh.17-0014</idno><date when="2017">2017</date><idno type="wicri:Area/Pmc/Corpus">000898</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">000898</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">A Systematic Review and Meta-Analysis of Practices Exposing Humans to Avian Influenza Viruses, Their Prevalence, and Rationale</title><author><name sortKey="Fournie, Guillaume" sort="Fournie, Guillaume" uniqKey="Fournie G" first="Guillaume" last="Fournié">Guillaume Fournié</name><affiliation><nlm:aff id="aff1">Veterinary Epidemiology, Economics and Public Health Group, Department of Pathobiology and Population Sciences, Royal Veterinary College, Hatfield, United Kingdom</nlm:aff></affiliation></author><author><name sortKey="H G, Erling" sort="H G, Erling" uniqKey="H G E" first="Erling" last="H G">Erling H G</name><affiliation><nlm:aff id="aff2">Department of Global Health and Development, London School of Hygiene and Tropical Medicine, London, United Kingdom</nlm:aff></affiliation></author><author><name sortKey="Barnett, Tony" sort="Barnett, Tony" uniqKey="Barnett T" first="Tony" last="Barnett">Tony Barnett</name><affiliation><nlm:aff id="aff2">Department of Global Health and Development, London School of Hygiene and Tropical Medicine, London, United Kingdom</nlm:aff></affiliation></author><author><name sortKey="Pfeiffer, Dirk U" sort="Pfeiffer, Dirk U" uniqKey="Pfeiffer D" first="Dirk U." last="Pfeiffer">Dirk U. Pfeiffer</name><affiliation><nlm:aff id="aff1">Veterinary Epidemiology, Economics and Public Health Group, Department of Pathobiology and Population Sciences, Royal Veterinary College, Hatfield, United Kingdom</nlm:aff></affiliation><affiliation><nlm:aff id="aff3">School of Veterinary Medicine, City University of Hong Kong, Kowloon, Hong Kong</nlm:aff></affiliation></author><author><name sortKey="Mangtani, Punam" sort="Mangtani, Punam" uniqKey="Mangtani P" first="Punam" last="Mangtani">Punam Mangtani</name><affiliation><nlm:aff id="aff4">Department of Infectious Disease Epidemiology, London School of Hygiene and Tropical Medicine, London, United Kingdom</nlm:aff></affiliation></author></analytic><series><title level="j">The American Journal of Tropical Medicine and Hygiene</title><idno type="ISSN">0002-9637</idno><idno type="eISSN">1476-1645</idno><imprint><date when="2017">2017</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><title>Abstract.</title><p>Almost all human infections by avian influenza viruses (AIVs) are transmitted from poultry. A systematic review was conducted to identify practices associated with human infections, their prevalence, and rationale. Observational studies were identified through database searches. Meta-analysis produced combined odds ratio estimates. The prevalence of practices and rationales for their adoptions were reported. Of the 48,217 records initially identified, 65 articles were included. Direct and indirect exposures to poultry were associated with infection for all investigated viral subtypes and settings. For the most frequently reported practices, association with infection seemed stronger in markets than households, for sick and dead than healthy poultry, and for H7N9 than H5N1. Practices were often described in general terms and their frequency and intensity of contact were not provided. The prevalence of practices was highly variable across studies, and no studies comprehensively explored reasons behind the adoption of practices. Combining epidemiological and targeted anthropological studies would increase the spectrum and detail of practices that could be investigated and should aim to provide insights into the rationale(s) for their existence. A better understanding of these rationales may help to design more realistic and acceptable preventive public health measures and messages.</p></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Webster, Rg" uniqKey="Webster R">RG Webster</name></author><author><name sortKey="Bean, Wj" uniqKey="Bean W">WJ Bean</name></author><author><name sortKey="Gorman, Ot" uniqKey="Gorman O">OT Gorman</name></author><author><name sortKey="Chambers, Tm" uniqKey="Chambers T">TM Chambers</name></author><author><name sortKey="Kawaoka, Y" uniqKey="Kawaoka Y">Y Kawaoka</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Kawaoka, Y" uniqKey="Kawaoka Y">Y Kawaoka</name></author><author><name sortKey="Krauss, S" uniqKey="Krauss S">S Krauss</name></author><author><name sortKey="Webster, Rg" uniqKey="Webster R">RG Webster</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Smith, Gj" uniqKey="Smith G">GJ Smith</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Freidl, Gs" uniqKey="Freidl G">GS Freidl</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Khan, Su" uniqKey="Khan S">SU Khan</name></author><author><name sortKey="Anderson, Bd" uniqKey="Anderson B">BD Anderson</name></author><author><name sortKey="Heil, Gl" uniqKey="Heil G">GL Heil</name></author><author><name sortKey="Liang, S" uniqKey="Liang S">S Liang</name></author><author><name sortKey="Gray, Gc" uniqKey="Gray G">GC Gray</name></author></analytic></biblStruct><biblStruct></biblStruct><biblStruct><analytic><author><name sortKey="Li, C" uniqKey="Li C">C Li</name></author><author><name sortKey="Hatta, M" uniqKey="Hatta M">M Hatta</name></author><author><name sortKey="Nidom, Ca" uniqKey="Nidom C">CA Nidom</name></author><author><name sortKey="Muramoto, Y" uniqKey="Muramoto Y">Y Muramoto</name></author><author><name sortKey="Watanabe, S" uniqKey="Watanabe S">S Watanabe</name></author><author><name sortKey="Neumann, G" uniqKey="Neumann G">G Neumann</name></author><author><name sortKey="Kawaoka, Y" uniqKey="Kawaoka Y">Y Kawaoka</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Russell, Ca" uniqKey="Russell C">CA Russell</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Rabinowitz, P" uniqKey="Rabinowitz P">P Rabinowitz</name></author><author><name sortKey="Perdue, M" uniqKey="Perdue M">M Perdue</name></author><author><name sortKey="Mumford, E" uniqKey="Mumford E">E Mumford</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Van Kerkhove, Md" uniqKey="Van Kerkhove M">MD Van Kerkhove</name></author><author><name sortKey="Mumford, E" uniqKey="Mumford E">E Mumford</name></author><author><name sortKey="Mounts, Aw" uniqKey="Mounts A">AW Mounts</name></author><author><name sortKey="Bresee, J" uniqKey="Bresee J">J Bresee</name></author><author><name sortKey="Ly, S" uniqKey="Ly S">S Ly</name></author><author><name sortKey="Bridges, Cb" uniqKey="Bridges C">CB Bridges</name></author><author><name sortKey="Otte, J" uniqKey="Otte J">J Otte</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Lai, S" uniqKey="Lai S">S Lai</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Costard, S" uniqKey="Costard S">S Costard</name></author><author><name sortKey="Fournie, G" uniqKey="Fournie G">G Fournie</name></author><author><name sortKey="Pfeiffer, Du" uniqKey="Pfeiffer D">DU Pfeiffer</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Moher, D" uniqKey="Moher D">D Moher</name></author><author><name sortKey="Liberati, A" uniqKey="Liberati A">A Liberati</name></author><author><name sortKey="Tetzlaff, J" uniqKey="Tetzlaff J">J Tetzlaff</name></author><author><name sortKey="Altman, Dg" uniqKey="Altman D">DG Altman</name></author><author><name sortKey="Group, P" uniqKey="Group P">P Group</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Claas, Ec" uniqKey="Claas E">EC Claas</name></author><author><name sortKey="Osterhaus, Ad" uniqKey="Osterhaus A">AD Osterhaus</name></author><author><name sortKey="Van Beek, R" uniqKey="Van Beek R">R van Beek</name></author><author><name sortKey="De Jong, Jc" uniqKey="De Jong J">JC De Jong</name></author><author><name sortKey="Rimmelzwaan, Gf" uniqKey="Rimmelzwaan G">GF Rimmelzwaan</name></author><author><name sortKey="Senne, Da" uniqKey="Senne D">DA Senne</name></author><author><name sortKey="Krauss, S" uniqKey="Krauss S">S Krauss</name></author><author><name sortKey="Shortridge, Kf" uniqKey="Shortridge K">KF Shortridge</name></author><author><name sortKey="Webster, Rg" uniqKey="Webster R">RG Webster</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Sterne, Jac" uniqKey="Sterne J">JAC Sterne</name></author><author><name sortKey="Higgins, Jpt" uniqKey="Higgins J">JPT Higgins</name></author><author><name sortKey="Reeves, Bc" uniqKey="Reeves B">BC Reeves</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Higgins, Jp" uniqKey="Higgins J">JP Higgins</name></author><author><name sortKey="Thompson, Sg" uniqKey="Thompson S">SG Thompson</name></author><author><name sortKey="Deeks, Jj" uniqKey="Deeks J">JJ Deeks</name></author><author><name sortKey="Altman, Dg" uniqKey="Altman D">DG Altman</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Dersimonian, R" uniqKey="Dersimonian R">R DerSimonian</name></author><author><name sortKey="Laird, N" uniqKey="Laird N">N Laird</name></author></analytic></biblStruct><biblStruct></biblStruct><biblStruct><analytic><author><name sortKey="Viechtbauer, W" uniqKey="Viechtbauer W">W Viechtbauer</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Mounts, Aw" uniqKey="Mounts A">AW Mounts</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Zhou, L" uniqKey="Zhou L">L Zhou</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Areechokchai, D" uniqKey="Areechokchai D">D Areechokchai</name></author><author><name sortKey="Jiraphongsa, C" uniqKey="Jiraphongsa C">C Jiraphongsa</name></author><author><name sortKey="Laosiritaworn, Y" uniqKey="Laosiritaworn Y">Y Laosiritaworn</name></author><author><name sortKey="Hanshaoworakul, W" uniqKey="Hanshaoworakul W">W Hanshaoworakul</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Dinh, Pn" uniqKey="Dinh P">PN Dinh</name></author><author><name sortKey="Long, Ht" uniqKey="Long H">HT Long</name></author><author><name sortKey="Tien, Nt" uniqKey="Tien N">NT Tien</name></author><author><name sortKey="Hien, Nt" uniqKey="Hien N">NT Hien</name></author><author><name sortKey="Mai Le, Tq" uniqKey="Mai Le T">TQ Mai le</name></author><author><name sortKey="Phong Le, H" uniqKey="Phong Le H">H Phong le</name></author><author><name sortKey="Tuan Le, V" uniqKey="Tuan Le V">V Tuan le</name></author><author><name sortKey="Van Tan, H" uniqKey="Van Tan H">H Van Tan</name></author><author><name sortKey="Nguyen, Nb" uniqKey="Nguyen N">NB Nguyen</name></author><author><name sortKey="Van Tu, P" uniqKey="Van Tu P">P Van Tu</name></author><author><name sortKey="Phuong, Nt" uniqKey="Phuong N">NT Phuong</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Yupiana, Y" uniqKey="Yupiana Y">Y Yupiana</name></author><author><name sortKey="De Vlas, Sj" uniqKey="De Vlas S">SJ de Vlas</name></author><author><name sortKey="Adnan, Nm" uniqKey="Adnan N">NM Adnan</name></author><author><name sortKey="Richardus, Jh" uniqKey="Richardus J">JH Richardus</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Vong, S" uniqKey="Vong S">S Vong</name></author><author><name sortKey="Ly, S" uniqKey="Ly S">S Ly</name></author><author><name sortKey="Van Kerkhove, Md" uniqKey="Van Kerkhove M">MD Van Kerkhove</name></author><author><name sortKey="Achenbach, J" uniqKey="Achenbach J">J Achenbach</name></author><author><name sortKey="Holl, D" uniqKey="Holl D">D Holl</name></author><author><name sortKey="Buchy, P" uniqKey="Buchy P">P Buchy</name></author><author><name sortKey="Sorn, S" uniqKey="Sorn S">S Sorn</name></author><author><name sortKey="Seng, H" uniqKey="Seng H">H Seng</name></author><author><name sortKey="Uyeki, Tm" uniqKey="Uyeki T">TM Uyeki</name></author><author><name sortKey="Sok, T" uniqKey="Sok T">T Sok</name></author><author><name sortKey="Katz, Jm" uniqKey="Katz J">JM Katz</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Bridges, Cb" uniqKey="Bridges C">CB Bridges</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Cavailler, P" uniqKey="Cavailler P">P Cavailler</name></author><author><name sortKey="Chu, S" uniqKey="Chu S">S Chu</name></author><author><name sortKey="Ly, S" uniqKey="Ly S">S Ly</name></author><author><name sortKey="Garcia, Jm" uniqKey="Garcia J">JM Garcia</name></author><author><name sortKey="Ha Do, Q" uniqKey="Ha Do Q">Q Ha do</name></author><author><name sortKey="Bergeri, I" uniqKey="Bergeri I">I Bergeri</name></author><author><name sortKey="Som, L" uniqKey="Som L">L Som</name></author><author><name sortKey="Sok, T" uniqKey="Sok T">T Sok</name></author><author><name sortKey="Vong, S" uniqKey="Vong S">S Vong</name></author><author><name sortKey="Buchy, P" uniqKey="Buchy P">P Buchy</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Huo, X" uniqKey="Huo X">X Huo</name></author><author><name sortKey="Zu, Rq" uniqKey="Zu R">RQ Zu</name></author><author><name sortKey="Qi, X" uniqKey="Qi X">X Qi</name></author><author><name sortKey="Qin, Yf" uniqKey="Qin Y">YF Qin</name></author><author><name sortKey="Li, L" uniqKey="Li L">L Li</name></author><author><name sortKey="Tang, Fy" uniqKey="Tang F">FY Tang</name></author><author><name sortKey="Hu, Zb" uniqKey="Hu Z">ZB Hu</name></author><author><name sortKey="Zhu, Fc" uniqKey="Zhu F">FC Zhu</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Li, Lh" uniqKey="Li L">LH Li</name></author><author><name sortKey="Yu, Z" uniqKey="Yu Z">Z Yu</name></author><author><name sortKey="Chen, Ws" uniqKey="Chen W">WS Chen</name></author><author><name sortKey="Liu, Sl" uniqKey="Liu S">SL Liu</name></author><author><name sortKey="Lu, Y" uniqKey="Lu Y">Y Lu</name></author><author><name sortKey="Zhang, Yj" uniqKey="Zhang Y">YJ Zhang</name></author><author><name sortKey="Chen, Ef" uniqKey="Chen E">EF Chen</name></author><author><name sortKey="Lin, Jf" uniqKey="Lin J">JF Lin</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Gomaa, Mr" uniqKey="Gomaa M">MR Gomaa</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Li, J" uniqKey="Li J">J Li</name></author><author><name sortKey="Chen, J" uniqKey="Chen J">J Chen</name></author><author><name sortKey="Yang, G" uniqKey="Yang G">G Yang</name></author><author><name sortKey="Zheng, Yx" uniqKey="Zheng Y">YX Zheng</name></author><author><name sortKey="Mao, Sh" uniqKey="Mao S">SH Mao</name></author><author><name sortKey="Zhu, Wp" uniqKey="Zhu W">WP Zhu</name></author><author><name sortKey="Yu, Xl" uniqKey="Yu X">XL Yu</name></author><author><name sortKey="Gao, Y" uniqKey="Gao Y">Y Gao</name></author><author><name sortKey="Pan, Qc" uniqKey="Pan Q">QC Pan</name></author><author><name sortKey="Yuan, Za" uniqKey="Yuan Z">ZA Yuan</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Liu, B" uniqKey="Liu B">B Liu</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="He, F" uniqKey="He F">F He</name></author><author><name sortKey="Zhang, M" uniqKey="Zhang M">M Zhang</name></author><author><name sortKey="Wang, Xy" uniqKey="Wang X">XY Wang</name></author><author><name sortKey="Wu, Hc" uniqKey="Wu H">HC Wu</name></author><author><name sortKey="Shang, Xp" uniqKey="Shang X">XP Shang</name></author><author><name sortKey="Li, Fd" uniqKey="Li F">FD Li</name></author><author><name sortKey="Wu, C" uniqKey="Wu C">C Wu</name></author><author><name sortKey="Lin, Jf" uniqKey="Lin J">JF Lin</name></author><author><name sortKey="Zhu, Bp" uniqKey="Zhu B">BP Zhu</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Ai, J" uniqKey="Ai J">J Ai</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Yu, H" uniqKey="Yu H">H Yu</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Fang, Lq" uniqKey="Fang L">LQ Fang</name></author><author><name sortKey="Li, Xl" uniqKey="Li X">XL Li</name></author><author><name sortKey="Liu, K" uniqKey="Liu K">K Liu</name></author><author><name sortKey="Li, Yj" uniqKey="Li Y">YJ Li</name></author><author><name sortKey="Yao, Hw" uniqKey="Yao H">HW Yao</name></author><author><name sortKey="Liang, S" uniqKey="Liang S">S Liang</name></author><author><name sortKey="Yang, Y" uniqKey="Yang Y">Y Yang</name></author><author><name sortKey="Feng, Zj" uniqKey="Feng Z">ZJ Feng</name></author><author><name sortKey="Gray, Gc" uniqKey="Gray G">GC Gray</name></author><author><name sortKey="Cao, Wc" uniqKey="Cao W">WC Cao</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Fuller, T" uniqKey="Fuller T">T Fuller</name></author><author><name sortKey="Havers, F" uniqKey="Havers F">F Havers</name></author><author><name sortKey="Xu, C" uniqKey="Xu C">C Xu</name></author><author><name sortKey="Fang, Lq" uniqKey="Fang L">LQ Fang</name></author><author><name sortKey="Cao, Wc" uniqKey="Cao W">WC Cao</name></author><author><name sortKey="Shu, Y" uniqKey="Shu Y">Y Shu</name></author><author><name sortKey="Widdowson, Ma" uniqKey="Widdowson M">MA Widdowson</name></author><author><name sortKey="Smith, Tb" uniqKey="Smith T">TB Smith</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Wu, P" uniqKey="Wu P">P Wu</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Wang, X" uniqKey="Wang X">X Wang</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Ahad, A" uniqKey="Ahad A">A Ahad</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Yang, P" uniqKey="Yang P">P Yang</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Yu, Q" uniqKey="Yu Q">Q Yu</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Sultana, R" uniqKey="Sultana R">R Sultana</name></author><author><name sortKey="Nahar, N" uniqKey="Nahar N">N Nahar</name></author><author><name sortKey="Rimi, Na" uniqKey="Rimi N">NA Rimi</name></author><author><name sortKey="Azad, S" uniqKey="Azad S">S Azad</name></author><author><name sortKey="Islam, Ms" uniqKey="Islam M">MS Islam</name></author><author><name sortKey="Gurley, Es" uniqKey="Gurley E">ES Gurley</name></author><author><name sortKey="Luby, Sp" uniqKey="Luby S">SP Luby</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Sultana, R" uniqKey="Sultana R">R Sultana</name></author><author><name sortKey="Rimi, Na" uniqKey="Rimi N">NA Rimi</name></author><author><name sortKey="Azad, S" uniqKey="Azad S">S Azad</name></author><author><name sortKey="Islam, Ms" uniqKey="Islam M">MS Islam</name></author><author><name sortKey="Khan, Msu" uniqKey="Khan M">MSU Khan</name></author><author><name sortKey="Gurley, Es" uniqKey="Gurley E">ES Gurley</name></author><author><name sortKey="Nahar, N" uniqKey="Nahar N">N Nahar</name></author><author><name sortKey="Luby, Sp" uniqKey="Luby S">SP Luby</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Edirne, T" uniqKey="Edirne T">T Edirne</name></author><author><name sortKey="Avci, Dk" uniqKey="Avci D">DK Avci</name></author><author><name sortKey="Dagkara, B" uniqKey="Dagkara B">B Dagkara</name></author><author><name sortKey="Aslan, M" uniqKey="Aslan M">M Aslan</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Ma, X" uniqKey="Ma X">X Ma</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Liao, Qy" uniqKey="Liao Q">QY Liao</name></author><author><name sortKey="Lam, Wwt" uniqKey="Lam W">WWT Lam</name></author><author><name sortKey="Bich, Th" uniqKey="Bich T">TH Bich</name></author><author><name sortKey="Dang, Vt" uniqKey="Dang V">VT Dang</name></author><author><name sortKey="Fielding, R" uniqKey="Fielding R">R Fielding</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Rimi, Na" uniqKey="Rimi N">NA Rimi</name></author><author><name sortKey="Sultana, R" uniqKey="Sultana R">R Sultana</name></author><author><name sortKey="Ishtiak Ahmed, K" uniqKey="Ishtiak Ahmed K">K Ishtiak-Ahmed</name></author><author><name sortKey="Khan, Su" uniqKey="Khan S">SU Khan</name></author><author><name sortKey="Sharker, May" uniqKey="Sharker M">MAY Sharker</name></author><author><name sortKey="Uz Zaman, R" uniqKey="Uz Zaman R">R Uz Zaman</name></author><author><name sortKey="Azziz Baumgartner, E" uniqKey="Azziz Baumgartner E">E Azziz-Baumgartner</name></author><author><name sortKey="Gurley, Es" uniqKey="Gurley E">ES Gurley</name></author><author><name sortKey="Nahar, N" uniqKey="Nahar N">N Nahar</name></author><author><name sortKey="Luby, Sp" uniqKey="Luby S">SP Luby</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Negro Calduch, E" uniqKey="Negro Calduch E">E Negro-Calduch</name></author><author><name sortKey="Elfadaly, S" uniqKey="Elfadaly S">S Elfadaly</name></author><author><name sortKey="Tibbo, M" uniqKey="Tibbo M">M Tibbo</name></author><author><name sortKey="Ankers, P" uniqKey="Ankers P">P Ankers</name></author><author><name sortKey="Bailey, E" uniqKey="Bailey E">E Bailey</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Barennes, H" uniqKey="Barennes H">H Barennes</name></author><author><name sortKey="Harimanana, An" uniqKey="Harimanana A">AN Harimanana</name></author><author><name sortKey="Lorvongseng, S" uniqKey="Lorvongseng S">S Lorvongseng</name></author><author><name sortKey="Ongkhammy, S" uniqKey="Ongkhammy S">S Ongkhammy</name></author><author><name sortKey="Chu, C" uniqKey="Chu C">C Chu</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Barennes, H" uniqKey="Barennes H">H Barennes</name></author><author><name sortKey="Martinez Aussel, B" uniqKey="Martinez Aussel B">B Martinez-Aussel</name></author><author><name sortKey="Vongphrachanh, P" uniqKey="Vongphrachanh P">P Vongphrachanh</name></author><author><name sortKey="Strobe, M" uniqKey="Strobe M">M Strobe</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Sutanto, Yc" uniqKey="Sutanto Y">YC Sutanto</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Shortridge, Kf" uniqKey="Shortridge K">KF Shortridge</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Fournie, G" uniqKey="Fournie G">G Fournié</name></author><author><name sortKey="Guitian, J" uniqKey="Guitian J">J Guitian</name></author><author><name sortKey="Mangtani, P" uniqKey="Mangtani P">P Mangtani</name></author><author><name sortKey="Ghani, Ac" uniqKey="Ghani A">AC Ghani</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Tellier, R" uniqKey="Tellier R">R Tellier</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Webster, Rg" uniqKey="Webster R">RG Webster</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Allen, Vm" uniqKey="Allen V">VM Allen</name></author><author><name sortKey="Hinton, Mh" uniqKey="Hinton M">MH Hinton</name></author><author><name sortKey="Tinker, Db" uniqKey="Tinker D">DB Tinker</name></author><author><name sortKey="Gibson, C" uniqKey="Gibson C">C Gibson</name></author><author><name sortKey="Mead, Gc" uniqKey="Mead G">GC Mead</name></author><author><name sortKey="Wathes, Cm" uniqKey="Wathes C">CM Wathes</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Offeddu, V" uniqKey="Offeddu V">V Offeddu</name></author><author><name sortKey="Cowling, Bj" uniqKey="Cowling B">BJ Cowling</name></author><author><name sortKey="Malik Peiris, Js" uniqKey="Malik Peiris J">JS Malik Peiris</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Hill, Ab" uniqKey="Hill A">AB Hill</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Lucas, Rm" uniqKey="Lucas R">RM Lucas</name></author><author><name sortKey="Mcmichael, Aj" uniqKey="Mcmichael A">AJ McMichael</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Aunger, R" uniqKey="Aunger R">R Aunger</name></author><author><name sortKey="Curtis, V" uniqKey="Curtis V">V Curtis</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Barnett, T" uniqKey="Barnett T">T Barnett</name></author><author><name sortKey="Fournie, G" uniqKey="Fournie G">G Fournie</name></author><author><name sortKey="Gupta, S" uniqKey="Gupta S">S Gupta</name></author><author><name sortKey="Seeley, J" uniqKey="Seeley J">J Seeley</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Barnett, T" uniqKey="Barnett T">T Barnett</name></author><author><name sortKey="Seeley, J" uniqKey="Seeley J">J Seeley</name></author><author><name sortKey="Levin, J" uniqKey="Levin J">J Levin</name></author><author><name sortKey="Katongole, J" uniqKey="Katongole J">J Katongole</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Biran, A" uniqKey="Biran A">A Biran</name></author><author><name sortKey="Schmidt, Wp" uniqKey="Schmidt W">WP Schmidt</name></author><author><name sortKey="Varadharajan, Ks" uniqKey="Varadharajan K">KS Varadharajan</name></author><author><name sortKey="Rajaraman, D" uniqKey="Rajaraman D">D Rajaraman</name></author><author><name sortKey="Kumar, R" uniqKey="Kumar R">R Kumar</name></author><author><name sortKey="Greenland, K" uniqKey="Greenland K">K Greenland</name></author><author><name sortKey="Gopalan, B" uniqKey="Gopalan B">B Gopalan</name></author><author><name sortKey="Aunger, R" uniqKey="Aunger R">R Aunger</name></author><author><name sortKey="Curtis, V" uniqKey="Curtis V">V Curtis</name></author></analytic></biblStruct></listBibl></div1></back></TEI><pmc article-type="research-article"><pmc-dir>properties open_access</pmc-dir>
<front><journal-meta><journal-id journal-id-type="nlm-ta">Am J Trop Med Hyg</journal-id><journal-id journal-id-type="iso-abbrev">Am. J. Trop. Med. Hyg</journal-id><journal-id journal-id-type="publisher-id">tpmd</journal-id><journal-id journal-id-type="hwp">tropmed</journal-id><journal-title-group><journal-title>The American Journal of Tropical Medicine and Hygiene</journal-title></journal-title-group><issn pub-type="ppub">0002-9637</issn><issn pub-type="epub">1476-1645</issn><publisher><publisher-name>The American Society of Tropical Medicine and Hygiene</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">28749769</article-id><article-id pub-id-type="pmc">5544094</article-id><article-id pub-id-type="publisher-id">tpmd170014</article-id><article-id pub-id-type="doi">10.4269/ajtmh.17-0014</article-id><article-categories><subj-group subj-group-type="heading"><subject>Articles</subject></subj-group></article-categories><title-group><article-title>A Systematic Review and Meta-Analysis of Practices Exposing Humans to Avian Influenza Viruses, Their Prevalence, and Rationale</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Fournié</surname><given-names>Guillaume</given-names></name><xref ref-type="aff" rid="aff1"><sup>1</sup></xref><xref rid="cor1" ref-type="corresp">*</xref></contrib><contrib contrib-type="author"><name><surname>Høg</surname><given-names>Erling</given-names></name><xref ref-type="aff" rid="aff2"><sup>2</sup></xref></contrib><contrib contrib-type="author"><name><surname>Barnett</surname><given-names>Tony</given-names></name><xref ref-type="aff" rid="aff2"><sup>2</sup></xref></contrib><contrib contrib-type="author"><name><surname>Pfeiffer</surname><given-names>Dirk U.</given-names></name><xref ref-type="aff" rid="aff1"><sup>1</sup></xref><xref ref-type="aff" rid="aff3"><sup>3</sup></xref></contrib><contrib contrib-type="author"><name><surname>Mangtani</surname><given-names>Punam</given-names></name><xref ref-type="aff" rid="aff4"><sup>4</sup></xref></contrib></contrib-group><aff id="aff1"><label>1</label>Veterinary Epidemiology, Economics and Public Health Group, Department of Pathobiology and Population Sciences, Royal Veterinary College, Hatfield, United Kingdom</aff><aff id="aff2"><label>2</label>Department of Global Health and Development, London School of Hygiene and Tropical Medicine, London, United Kingdom</aff><aff id="aff3"><label>3</label>School of Veterinary Medicine, City University of Hong Kong, Kowloon, Hong Kong</aff><aff id="aff4"><label>4</label>Department of Infectious Disease Epidemiology, London School of Hygiene and Tropical Medicine, London, United Kingdom</aff><author-notes><corresp id="cor1"><label>*</label>Address correspondence to Guillaume Fournié, Veterinary Epidemiology, Economics and Public Health Group, Department of Pathobiology and Population Sciences, Royal Veterinary College, Hawkshead Lane, North Mymms, Hatfield AL9 7TA, UK. E-mail: <email>gfournie@rvc.ac.uk</email></corresp><fn fn-type="supported-by" id="fn2"><p>Financial support: This work was supported by the BALZAC research program “Behavioural adaptations in live poultry trading and farming systems and zoonoses control in Bangladesh” (BB/L018993/1). This is one of 11 programs funded under ZELS, a joint research initiative between Biotechnology and Biological Sciences Research Council (BBSRC), Defence Science and Technology Laboratory (DSTL), Department for International Development (DFID), Economic and Social Sciences Research Council (ESRC); Medical Research Council (MRC) and Natural Environment Research Council (NERC).</p></fn><fn fn-type="present-address" id="fn3"><p>Authors' addresses: Guillaume Fournié, Veterinary Epidemiology, Economics and Public Health Group, Department of Production and Population Health, Royal Veterinary College, Hatfield, UK, E-mail: <email>gfournie@rvc.ac.uk</email>. Erling Høg and Tony Barnett, Department of Global Health and Development, London School of Hygiene and Tropical Medicine, London, UK, E-mails: <email>erling.hoeg@lshtm.ac.uk</email> and <email>tony.barnett@lshtm.ac.uk</email>. Dirk U. Pfeiffer, School of Veterinary Medicine, City University of Hong Kong, Kowloon, Hong Kong, E-mail: <email>dirk.pfeiffer@cityu.edu.hk</email>. Punam Mangtani, Department of Infectious Disease Epidemiology, London School of Hygiene and Tropical Medicine, London, UK, E-mail: <email>punam.mangtani@lshtm.ac.uk</email>.</p></fn></author-notes><pub-date pub-type="ppub"><day>02</day><month>8</month><year>2017</year></pub-date><pub-date pub-type="epub"><day>15</day><month>5</month><year>2017</year></pub-date><pub-date pub-type="pmc-release"><day>15</day><month>5</month><year>2017</year></pub-date><pmc-comment> PMC Release delay is 0 months and 0 days and was based on the
<volume>97</volume><issue>2</issue><fpage>376</fpage><lpage>388</lpage><history><date date-type="received"><day>08</day><month>1</month><year>2017</year></date><date date-type="accepted"><day>24</day><month>3</month><year>2017</year></date></history><permissions><copyright-statement>© The American Society of Tropical Medicine and Hygiene</copyright-statement><copyright-year>2017</copyright-year><license license-type="open-access"><license-p>This is an open-access article distributed under the terms of the <ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/licenses/by/4.0/">Creative Commons Attribution License</ext-link>, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.</license-p></license></permissions><self-uri xlink:title="pdf" xlink:type="simple" xlink:href="tpmd170014.pdf"></self-uri><abstract><title>Abstract.</title><p>Almost all human infections by avian influenza viruses (AIVs) are transmitted from poultry. A systematic review was conducted to identify practices associated with human infections, their prevalence, and rationale. Observational studies were identified through database searches. Meta-analysis produced combined odds ratio estimates. The prevalence of practices and rationales for their adoptions were reported. Of the 48,217 records initially identified, 65 articles were included. Direct and indirect exposures to poultry were associated with infection for all investigated viral subtypes and settings. For the most frequently reported practices, association with infection seemed stronger in markets than households, for sick and dead than healthy poultry, and for H7N9 than H5N1. Practices were often described in general terms and their frequency and intensity of contact were not provided. The prevalence of practices was highly variable across studies, and no studies comprehensively explored reasons behind the adoption of practices. Combining epidemiological and targeted anthropological studies would increase the spectrum and detail of practices that could be investigated and should aim to provide insights into the rationale(s) for their existence. A better understanding of these rationales may help to design more realistic and acceptable preventive public health measures and messages.</p></abstract><counts><page-count count="13"></page-count></counts></article-meta><notes notes-type="disclaimer"><p>Note: Supplemental texts, tables, and figures appear at <ext-link ext-link-type="uri" xlink:href="http://www.ajtmh.org">www.ajtmh.org</ext-link>.</p></notes></front><body><sec id="sec1"><title>Introduction</title><p>All four of the influenza virus strains that resulted in pandemics in the last century have had an avian origin. While the 1918–1919 H1N1 pandemic strain was entirely derived from an avian virus,<xref rid="ref1" ref-type="bibr"><sup>1</sup></xref> the subsequent pandemic strains of H2N2 in 1957, H3N2 in 1968, and H1N1 in 2009 all acquired gene segments from avian viruses by reassortment.<xref rid="ref2" ref-type="bibr"><sup>2</sup></xref><sup>,</sup><xref rid="ref3" ref-type="bibr"><sup>3</sup></xref> Within the last 20 years, a variety of avian influenza virus (AIV) subtypes affecting domestic poultry—especially H5N1, H7N9, and H9N2—has resulted in human infections in mainly Asia and Egypt.<xref rid="ref4" ref-type="bibr"><sup>4</sup></xref><sup>–</sup><xref rid="ref6" ref-type="bibr"><sup>6</sup></xref> Although these zoonotic transfers are sporadic and their transmission is not sustained within human populations, they also show a potential for reassortment with human viruses<xref rid="ref7" ref-type="bibr"><sup>7</sup></xref>; a very few nucleotide substitutions in some circulating strains might allow them to be transmissible between humans.<xref rid="ref8" ref-type="bibr"><sup>8</sup></xref> It is widely feared that ongoing circulation of zoonotic AIVs within poultry populations and their transfer to humans could result in emergence of a novel human pandemic strain. As almost all human cases result from exposure to poultry or to environments contaminated by poultry,<xref rid="ref9" ref-type="bibr"><sup>9</sup></xref><sup>–</sup><xref rid="ref11" ref-type="bibr"><sup>11</sup></xref> mitigation measures intended to prevent zoonotic infections and reduce the risk of adaptation of these viruses to human hosts must be carefully targeted, not only toward the poultry populations sustaining these viruses<xref rid="ref12" ref-type="bibr"><sup>12</sup></xref> but also toward practices exposing people to infected poultry and contaminated environments. Mitigation measures have to take into account the complexity and difficulty of behavior change strategies and techniques, recognizing that “behavior” should not be construed as exclusively “individual” but as located within a socioeconomic and cultural milieu.</p><p>This study presents a systematic review of the scientific literature relating to practices exposing humans to AIVs in Asia and Egypt. The objectives of the review are to identify poultry exposure practices associated with human infection, describe their prevalence within human populations, and examine the rationales for their persistence. This review is informed by insights from social anthropology. It recognizes that the analytical category “practice(s)” as deployed in the literature reviewed largely ignores the social, economic, and cultural context(s) and the subjective meanings of such “practices” for the “practitioners.”</p></sec><sec id="sec2"><title>Materials and Methods</title><sec id="sec3"><title>Search strategy and selection criteria.</title><p>This systematic review adheres to PRISMA guidelines (see checklist in <ext-link ext-link-type="uri" xlink:href="/content/journals/10.4269/ajtmh.17-0014#supplementary_data">Supplemental Material</ext-link>).<xref rid="ref13" ref-type="bibr"><sup>13</sup></xref> A database search of MEDLINE, Science Citation Index, Social Science Citation Index, and The Zoological Record was conducted during the period October 10, 2014, to January 12, 2015. The search used the Boolean search criteria “A AND B”, as follows:<list list-type="simple"><list-item><label>A:</label><p>“avian influenza” OR “avian flu” OR “bird flu” OR “influenza A” OR “H5N1” OR “H7N7” OR “H7N9” OR “H9N2” and</p></list-item><list-item><label>B:</label><p>“animal-human” OR “backyard farms” OR “biosecurity” OR “chicken farms” OR “commercial farms” OR “cultural practices” OR “disease transmission” OR “duck farms” OR “exposure” OR “face masks” OR “farms” OR “gloves” OR “human exposure” OR “human infection” OR “live bird markets” OR “live poultry markets” OR “market practices” OR “markets” OR “occupational exposure” OR “poultry farms” OR “prevention” OR “risk” OR “risk + exposure” OR “risk behavior” OR “risk practices” OR “seroconversion” OR “seroprevalence” OR “transmission.”</p></list-item></list></p><p>The “Title”, “Keywords,” and “Abstract” fields were selected in all databases, except for the MEDLINE database which offered to search “All Fields.” EndNote was used to manage citations and remove duplicates.</p><p>Eligible articles had to be published between January 1, 1997, and December 31, 2014. This review start date was chosen because the first H5N1 human case was reported during that year.<xref rid="ref14" ref-type="bibr"><sup>14</sup></xref> Articles had to either assess 1) the association between poultry exposure practices and clinical or asymptomatic infection by AIVs (hereafter referred to as risk factor studies) or 2) the prevalence of these practices in human populations (hereafter referred as practice prevalence studies). The poultry exposure practices under consideration had to result in physical contact with poultry or contact with environments potentially contaminated by poultry. Human infections with AIVs could be either clinical cases that were laboratory confirmed or seropositive, asymptomatic individuals. If the association between a practice and human infection was assessed, a measure of effect had to be reported.</p><p>Practice prevalence studies included studies assessing proportions of individuals adopting defined practices in a given population, as well as studies only mentioning the presence or absence of defined practices in the study population. For both study types, searches were restricted to English-language publications and studies based in Asia and Egypt, where the subtypes currently causing most human cases (H5N1, H9N2, and H7N9) are endemic.<xref rid="ref4" ref-type="bibr"><sup>4</sup></xref><sup>–</sup><xref rid="ref6" ref-type="bibr"><sup>6</sup></xref> In addition, we assessed all studies identified in the initial search if they explored the reasons why people adopt practices, which may promote human exposure to avian influenza, whether they gave quantitative information on risk factors for infection or prevalence of practices.</p><p>Screening of titles and abstracts was carried out by one reviewer and checked by a second to remove studies unlikely to contain relevant information. Where exclusion could not be justified by one reviewer based solely on screening of a record's title and abstract, the full text was retrieved to allow both reviewers to reach a consensus.</p></sec><sec id="sec4"><title>Data analysis.</title><p>The quality of included risk factor studies was assessed using an adaptation of the Cochrane Risk of Bias Tool.<xref rid="ref15" ref-type="bibr"><sup>15</sup></xref> Risk of bias was assessed for the following domains: bias due to confounding, bias in the selection of participants into the study, bias in measurement of exposures, bias due to missing data and bias in measurement of outcome. Based on these domain-level assessments, the overall risk of bias of each study was assessed as low, moderate, serious, or critical (<ext-link ext-link-type="uri" xlink:href="/content/journals/10.4269/ajtmh.17-0014#supplementary_data">Supplemental Text 1</ext-link>, <ext-link ext-link-type="uri" xlink:href="/content/journals/10.4269/ajtmh.17-0014#supplementary_data">Supplemental Table 1</ext-link>). The quality of the practice prevalence studies was based on the rigor of the sampling strategy and the representativeness of the findings either at the province or country level. To be classified as Quality 1, participants had to be recruited using random sampling at the provincial (first administrative division) or national level. If sampling was not random (e.g., purposive and convenience) and/or the study was conducted at the level of a district (second administrative division) or lower, the study was classified as Quality 2.</p><p>For all studies, the following variables were extracted: study period, location, study design, study population, sample size, setting (household, live bird market [LBM], and farm). For risk factor studies, the following variables were also extracted: case definitions, poultry exposure practices measured, and their associated non-adjusted and adjusted measure of association with outcomes (e.g., odds ratio [OR]) along with their 95% confidence interval (CI) and <italic>P</italic> value. For practices that were investigated in two or more studies, we examined heterogeneity between studies using the <italic>I</italic><sup>2</sup> statistic,<xref rid="ref16" ref-type="bibr"><sup>16</sup></xref> and computed overall OR estimates using the random-effect model of DerSimonian and Laird.<xref rid="ref17" ref-type="bibr"><sup>17</sup></xref> As adjusted ORs were not reported in all studies, ORs that were not adjusted for other exposures were used as model inputs. A sensitivity analysis was conducted by differentiating studies according to their risk of bias and locations (<ext-link ext-link-type="uri" xlink:href="/content/journals/10.4269/ajtmh.17-0014#supplementary_data">Supplemental Text 2</ext-link>, <ext-link ext-link-type="uri" xlink:href="/content/journals/10.4269/ajtmh.17-0014#supplementary_data">Supplemental Tables 2</ext-link> and <ext-link ext-link-type="uri" xlink:href="/content/journals/10.4269/ajtmh.17-0014#supplementary_data">3</ext-link>).</p><p>For the practice prevalence studies, we focused on those practices identified a priori to be associated with human infection. For each practice, the proportion of people or households adopting it was extracted, along with the associated 95% CI. When the CI of a proportion was not mentioned in a paper, the binomial proportion CI (also referred to as the exact method) was calculated. These practices included raising poultry at home, keeping birds inside the house, visiting LBMs, touching poultry during purchase, handling (touching, selling, throwing, and incinerating) or eating sick or dead poultry, slaughtering poultry, and using personal protective equipment (PPE). We did not aim to compute overall estimates for the prevalence of each practice, but rather to describe variations in prevalence estimates for given practices across settings and studies. The range and median of reported prevalences and <italic>I</italic><sup>2</sup> statistic were reported. If some practice prevalence studies explored reasons why people adopted some of the practices of interest based on responses to interviews and observations, these rationales were extracted. Data were extracted by a first reviewer and then checked for missing data and inaccuracies by a second reviewer. A sensitivity analysis was conducted by differentiating studies according to their geographical location and their quality score (<ext-link ext-link-type="uri" xlink:href="/content/journals/10.4269/ajtmh.17-0014#supplementary_data">Supplemental Text 2</ext-link>, <ext-link ext-link-type="uri" xlink:href="/content/journals/10.4269/ajtmh.17-0014#supplementary_data">Supplemental Tables 4</ext-link> and <ext-link ext-link-type="uri" xlink:href="/content/journals/10.4269/ajtmh.17-0014#supplementary_data">5</ext-link>).</p><p>All analyses were run using R 3.2.2<xref rid="ref18" ref-type="bibr"><sup>18</sup></xref> and the package “metafor”.<xref rid="ref19" ref-type="bibr"><sup>19</sup></xref></p></sec><sec id="sec5"><title>Roles of the funding source.</title><p>The funders of the study had no role in study design, data collection, data analysis, data interpretation, or writing of the report. The corresponding author had full access to all the data in the study and had final responsibility for the decision to submit for publication.</p></sec></sec><sec id="sec6"><title>Results</title><sec id="sec7"><title>Study selection and characteristics.</title><p>In total, 547 full texts were screened. Of these, 65 articles were included in the systematic review (<xref ref-type="fig" rid="f1">Figure 1</xref>). Some articles reported multiple studies conducted in different countries over different years, targeting different populations (e.g., households and market workers) or focusing on different virus subtypes, and exploring both the presence of risk factors and the prevalence of practices. They were considered as separate studies. Twenty-three articles incorporated 24 <italic>risk factor studies</italic> (<xref ref-type="table" rid="t1">Table 1</xref>) and 46 articles presented 51 <italic>practice prevalence studies</italic> (<ext-link ext-link-type="uri" xlink:href="/content/journals/10.4269/ajtmh.17-0014#supplementary_data">Supplemental Table 8</ext-link>).</p><fig id="f1" position="float"><label>Figure 1.</label><caption><p>Flow of selected studies.</p></caption><graphic xlink:href="tpmd170014f1"></graphic></fig><table-wrap id="t1" position="float"><label>Table 1</label><caption><p>Characteristics of studies exploring risk or protective factors for avian influenza virus infection in humans</p></caption><table frame="hsides" rules="groups"><thead><tr><th align="center" rowspan="1" colspan="1">Reference</th><th align="center" rowspan="1" colspan="1">Location</th><th align="center" rowspan="1" colspan="1">Year(s)</th><th align="center" rowspan="1" colspan="1">Design</th><th align="center" rowspan="1" colspan="1">Study population and selection criteria</th><th align="center" rowspan="1" colspan="1"><italic>N</italic> (cases)</th><th align="center" rowspan="1" colspan="1">Case definition</th></tr></thead><tbody><tr><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"><italic>Incident cases of laboratory confirmed H5N1 clinical infection</italic></td></tr><tr><td rowspan="1" colspan="1">Mounts and others<xref rid="ref20" ref-type="bibr"><sup>20</sup></xref></td><td align="center" rowspan="1" colspan="1">China (HK)</td><td align="center" rowspan="1" colspan="1">1997</td><td align="center" rowspan="1" colspan="1">CC</td><td rowspan="1" colspan="1">H5N1 clinical cases, controls matched by age, sex, location</td><td align="char" char="(" rowspan="1" colspan="1">56 (15)</td><td rowspan="1" colspan="1">H5N1 clinical infection: respiratory illness and either a viral culture or a 4-fold rise in Ab titer</td></tr><tr><td rowspan="1" colspan="1">Zhou and others<xref rid="ref21" ref-type="bibr"><sup>21</sup></xref></td><td align="center" rowspan="1" colspan="1">China</td><td align="center" rowspan="1" colspan="1">2005–2008</td><td align="center" rowspan="1" colspan="1">CC</td><td rowspan="1" colspan="1">H5N1 clinical cases, controls matched by age, sex, location</td><td align="char" char="(" rowspan="1" colspan="1">162 (28)</td><td rowspan="1" colspan="1">H5N1 clinical infection: respiratory illness and either a viral culture, a 4-fold rise in Ab titer or a RT-PCR</td></tr><tr><td rowspan="1" colspan="1">Areechokchai and others<xref rid="ref22" ref-type="bibr"><sup>22</sup></xref></td><td align="center" rowspan="1" colspan="1">Thailand</td><td align="center" rowspan="1" colspan="1">2004</td><td align="center" rowspan="1" colspan="1">CC</td><td rowspan="1" colspan="1">H5N1 clinical cases, controls matched by age, location</td><td align="char" char="(" rowspan="1" colspan="1">80 (16)</td><td rowspan="1" colspan="1">H5N1 clinical infection: respiratory illness and viral culture or a RT-PCR</td></tr><tr><td rowspan="1" colspan="1">Dinh and others<xref rid="ref23" ref-type="bibr"><sup>23</sup></xref></td><td align="center" rowspan="1" colspan="1">Vietnam</td><td align="center" rowspan="1" colspan="1">2004</td><td align="center" rowspan="1" colspan="1">CC</td><td rowspan="1" colspan="1">H5N1 clinical cases, controls matched by age, sex, location</td><td align="char" char="(" rowspan="1" colspan="1">134 (28)</td><td rowspan="1" colspan="1">H5N1 clinical infection: respiratory illness and a RT-PCR</td></tr><tr><td rowspan="1" colspan="1">Yupiana and others<xref rid="ref24" ref-type="bibr"><sup>24</sup></xref></td><td align="center" rowspan="1" colspan="1">Indonesia</td><td align="center" rowspan="1" colspan="1">2005–2008</td><td align="center" rowspan="1" colspan="1">E</td><td rowspan="1" colspan="1">H5N1 clinical cases</td><td align="char" char="(" rowspan="1" colspan="1">34 (34)</td><td rowspan="1" colspan="1">H5N1 clinical infection: respiratory illness and either a viral culture, a 4-fold rise in Ab titer, a RT-PCR or MN Ab titer ≥ 1:80 and another serological test</td></tr><tr><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"><italic>Prevalent cases of laboratory confirmed H5N1 asymptomatic infection</italic></td></tr><tr><td rowspan="1" colspan="1">Vong and others<xref rid="ref25" ref-type="bibr"><sup>25</sup></xref></td><td align="center" rowspan="1" colspan="1">Cambodia</td><td align="center" rowspan="1" colspan="1">2006</td><td align="center" rowspan="1" colspan="1">CC</td><td rowspan="1" colspan="1">H5N1 seropositive rural residents, controls matched by age, sex, location and H5N1 poultry flock status</td><td align="char" char="(" rowspan="1" colspan="1">31 (7)</td><td rowspan="1" colspan="1">H5N1 seropositive: MN Ab titer ≥ 1:80 and Western blot</td></tr><tr><td rowspan="1" colspan="1">Bridges and others<xref rid="ref26" ref-type="bibr"><sup>26</sup></xref></td><td align="center" rowspan="1" colspan="1">China (HK)</td><td align="center" rowspan="1" colspan="1">1997–1998</td><td align="center" rowspan="1" colspan="1">CC</td><td rowspan="1" colspan="1">Poultry workers</td><td align="char" char="(" rowspan="1" colspan="1">1312 (81)</td><td rowspan="1" colspan="1">H5N1 seropositive: MN Ab titer ≥ 1:80 and Western blot</td></tr><tr><td rowspan="1" colspan="1">Cavailler and others<xref rid="ref27" ref-type="bibr"><sup>27</sup></xref></td><td align="center" rowspan="1" colspan="1">Cambodia</td><td align="center" rowspan="1" colspan="1">2007</td><td align="center" rowspan="1" colspan="1">CS</td><td rowspan="1" colspan="1">Rural residents</td><td align="char" char="(" rowspan="1" colspan="1">700 (18)</td><td rowspan="1" colspan="1">H5N1 seropositive: MN Ab titer ≥ 1:80 and HI Ab titer ≥ 1:160</td></tr><tr><td rowspan="1" colspan="1">Huo and others<xref rid="ref28" ref-type="bibr"><sup>28</sup></xref></td><td align="center" rowspan="1" colspan="1">China</td><td align="center" rowspan="1" colspan="1">2010</td><td align="center" rowspan="1" colspan="1">CS</td><td rowspan="1" colspan="1">Residents raising poultry nearby lakes with wildfowl</td><td align="char" char="(" rowspan="1" colspan="1">306 (8)</td><td rowspan="1" colspan="1">H5N1 seropositive: HI Ab titer ≥ 1:160</td></tr><tr><td rowspan="1" colspan="1">Li and others<xref rid="ref29" ref-type="bibr"><sup>29</sup></xref></td><td align="center" rowspan="1" colspan="1">China</td><td align="center" rowspan="1" colspan="1">2010–2012</td><td align="center" rowspan="1" colspan="1">CS</td><td rowspan="1" colspan="1">Poultry workers</td><td align="char" char="(" rowspan="1" colspan="1">1169 (55)</td><td rowspan="1" colspan="1">H5N1 seropositive: HI Ab titer ≥ 1:160 and MN</td></tr><tr><td rowspan="1" colspan="1">Gomaa and others<xref rid="ref30" ref-type="bibr"><sup>30</sup></xref></td><td align="center" rowspan="1" colspan="1">Egypt</td><td align="center" rowspan="1" colspan="1">2010–2011</td><td align="center" rowspan="1" colspan="1">CS</td><td rowspan="1" colspan="1">Rural residents</td><td align="char" char="(" rowspan="1" colspan="1">708 (15)</td><td rowspan="1" colspan="1">H5N1 seropositive: MN Ab titer ≥ 1:80 and HI test</td></tr><tr><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"><italic>Incident cases of laboratory confirmed H7N9 clinical infection</italic></td></tr><tr><td rowspan="1" colspan="1">Li and others<xref rid="ref31" ref-type="bibr"><sup>31</sup></xref></td><td align="center" rowspan="1" colspan="1">China</td><td align="center" rowspan="1" colspan="1">2013</td><td align="center" rowspan="1" colspan="1">CC</td><td rowspan="1" colspan="1">H7N9 clinical cases, controls matched by age, sex, location</td><td align="char" char="(" rowspan="1" colspan="1">100 (25)</td><td rowspan="1" colspan="1">H7N9 clinical infection: respiratory illness and either a viral culture, a 4-fold rise in Ab titer or a RT-PCR</td></tr><tr><td rowspan="1" colspan="1">Liu and others<xref rid="ref32" ref-type="bibr"><sup>32</sup></xref></td><td align="center" rowspan="1" colspan="1">China</td><td align="center" rowspan="1" colspan="1">2013</td><td align="center" rowspan="1" colspan="1">CC</td><td rowspan="1" colspan="1">H7N9 clinical cases, controls matched by age, sex, location</td><td align="char" char="(" rowspan="1" colspan="1">429 (89)</td><td rowspan="1" colspan="1">H7N9 clinical infection: respiratory illness and either a viral culture, a 4-fold rise in Ab titer or a RT-PCR</td></tr><tr><td rowspan="1" colspan="1">He and others<xref rid="ref33" ref-type="bibr"><sup>33</sup></xref></td><td align="center" rowspan="1" colspan="1">China</td><td align="center" rowspan="1" colspan="1">2013</td><td align="center" rowspan="1" colspan="1">CC</td><td rowspan="1" colspan="1">H7N9 clinical cases, controls matched by age, sex, location</td><td align="char" char="(" rowspan="1" colspan="1">258 (43)</td><td rowspan="1" colspan="1">H7N9 clinical infection: respiratory illness and either a viral culture, a 4-fold rise in Ab titer or a RT-PCR</td></tr><tr><td rowspan="1" colspan="1">Ai and others<xref rid="ref34" ref-type="bibr"><sup>34</sup></xref></td><td align="center" rowspan="1" colspan="1">China</td><td align="center" rowspan="1" colspan="1">2013</td><td align="center" rowspan="1" colspan="1">CC</td><td rowspan="1" colspan="1">H7N9 clinical cases, controls matched by age, sex, location</td><td align="char" char="(" rowspan="1" colspan="1">118 (25)</td><td rowspan="1" colspan="1">H7N9 clinical infection: respiratory illness and a RT-PCR</td></tr><tr><td rowspan="1" colspan="1">Yu and others<xref rid="ref35" ref-type="bibr"><sup>35</sup></xref></td><td align="center" rowspan="1" colspan="1">China</td><td align="center" rowspan="1" colspan="1">2013</td><td align="center" rowspan="1" colspan="1">E</td><td rowspan="1" colspan="1">H7N9 clinical cases</td><td align="char" char="(" rowspan="1" colspan="1">60 (60)</td><td rowspan="1" colspan="1">H7N9 clinical infection: respiratory illness and either a viral culture, a 4-fold rise in Ab titer or a RT-PCR. Eighteen rural cases, two cluster cases and four mild cases were excluded.</td></tr><tr><td rowspan="1" colspan="1">Fang and others<xref rid="ref36" ref-type="bibr"><sup>36</sup></xref></td><td align="center" rowspan="1" colspan="1">China</td><td align="center" rowspan="1" colspan="1">2013</td><td align="center" rowspan="1" colspan="1">E</td><td rowspan="1" colspan="1">H7N9 clinical cases</td><td align="char" char="(" rowspan="1" colspan="1">113 (113)</td><td rowspan="1" colspan="1">H7N9 clinical infection: respiratory illness and either a viral culture, a 4-fold rise in Ab titer or a RT-PCR</td></tr><tr><td rowspan="1" colspan="1">Fuller (2014)<xref rid="ref37" ref-type="bibr"><sup>37</sup></xref></td><td align="center" rowspan="1" colspan="1">China</td><td align="center" rowspan="1" colspan="1">2013</td><td align="center" rowspan="1" colspan="1">E</td><td rowspan="1" colspan="1">Individuals with respiratory illness tested for H7N9</td><td align="char" char="(" rowspan="1" colspan="1">NS</td><td rowspan="1" colspan="1">H7N9 clinical infection: respiratory illness and either a viral culture, or a RT-PCR</td></tr><tr><td rowspan="1" colspan="1">Wu and others<xref rid="ref38" ref-type="bibr"><sup>38</sup></xref></td><td align="center" rowspan="1" colspan="1">China</td><td align="center" rowspan="1" colspan="1">2013–2014</td><td align="center" rowspan="1" colspan="1">E</td><td rowspan="1" colspan="1">H7N9 clinical cases</td><td align="char" char="(" rowspan="1" colspan="1">182 (182)</td><td rowspan="1" colspan="1">H7N9 clinical infection: respiratory illness and either a viral culture, a 4-fold rise in Ab titer, or a RT-PCR</td></tr><tr><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"><italic>Incident cases of laboratory confirmed H7N9 asymptomatic infection</italic></td></tr><tr><td rowspan="1" colspan="1">Wang and others<xref rid="ref39" ref-type="bibr"><sup>39</sup></xref></td><td align="center" rowspan="1" colspan="1">China</td><td align="center" rowspan="1" colspan="1">2013</td><td align="center" rowspan="1" colspan="1">C</td><td rowspan="1" colspan="1">Poultry market workers in districts with H7N9-infected market</td><td align="char" char="(" rowspan="1" colspan="1">96 (52)</td><td rowspan="1" colspan="1">H7N9 seroconversion: HI Ab titer ≥ 1:40 in December, and a ≥ 4-fold rise from May to December.</td></tr><tr><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"><italic>Prevalent cases of laboratory confirmed H7 asymptomatic infection</italic></td></tr><tr><td rowspan="1" colspan="1">Ahad and others<xref rid="ref40" ref-type="bibr"><sup>40</sup></xref></td><td align="center" rowspan="1" colspan="1">Pakistan</td><td align="center" rowspan="1" colspan="1">2010–2011</td><td align="center" rowspan="1" colspan="1">CS</td><td rowspan="1" colspan="1">Chicken farm workers</td><td align="char" char="(" rowspan="1" colspan="1">354 (120)</td><td rowspan="1" colspan="1">H7 seropositive: HI Ab titer ≥ 1:160</td></tr><tr><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"><italic>Prevalent cases of laboratory confirmed H9 asymptomatic infection</italic></td></tr><tr><td rowspan="1" colspan="1">Yang and others<xref rid="ref41" ref-type="bibr"><sup>41</sup></xref></td><td align="center" rowspan="1" colspan="1">China</td><td align="center" rowspan="1" colspan="1">2011</td><td align="center" rowspan="1" colspan="1">CS</td><td rowspan="1" colspan="1">Duck farm workers</td><td align="char" char="(" rowspan="1" colspan="1">1741 (12)</td><td rowspan="1" colspan="1">H9 seropositive: HI Ab titer ≥ 1:40</td></tr><tr><td rowspan="1" colspan="1">Yu and others<xref rid="ref42" ref-type="bibr"><sup>42</sup></xref></td><td align="center" rowspan="1" colspan="1">China</td><td align="center" rowspan="1" colspan="1">2009–2010</td><td align="center" rowspan="1" colspan="1">CS</td><td rowspan="1" colspan="1">Poultry farm and abattoir workers</td><td align="char" char="(" rowspan="1" colspan="1">305 (14)</td><td rowspan="1" colspan="1">H9 seropositive: 2 MN Ab titer ≥ 1:80</td></tr><tr><td rowspan="1" colspan="1">Gomaa and others<xref rid="ref30" ref-type="bibr"><sup>30</sup></xref></td><td align="center" rowspan="1" colspan="1">Egypt</td><td align="center" rowspan="1" colspan="1">2010–2011</td><td align="center" rowspan="1" colspan="1">CS</td><td rowspan="1" colspan="1">Rural residents</td><td align="char" char="(" rowspan="1" colspan="1">648 (38)</td><td rowspan="1" colspan="1">H9 seropositive: MN Ab titer ≥ 1:80</td></tr></tbody></table><table-wrap-foot><fn id="tblfn1"><p>Ab titer = antibody titer; C = cohort; CC = case–control; CS = cross-sectional; E = ecological; HI = hemagglutination inhibition; HK = Hong Kong; MN = microneutralization assay; PCR = polymerase chain reaction. In case definition, respiratory illness includes pneumonia and influenza-like illness.</p></fn></table-wrap-foot></table-wrap><p>Twenty of the 24 risk factor studies investigated either H5N1 (<italic>N</italic> = 11) or H7N9 (<italic>N</italic> = 9) infections. Three studies detected H9 and one detected H7. Cases were defined as patients with a clinically apparent infection—as opposed to asymptomatic infection—in half of H5N1 studies and in all but one H7N9 studies. Most studies had either a case–control (<italic>N</italic> = 10) or a cross-sectional (<italic>N</italic> = 8) study design. Four out of the five ecological studies focused on H7N9, and there was only one cohort study. Half of the H5N1 studies and all H7N9 studies were conducted in China (including Hong Kong). Other study sites were Cambodia, Egypt, Indonesia, Pakistan, Thailand, and Vietnam. Six studies focused on workers in commercial poultry farms (as opposed to household flocks), markets, and/or abattoirs. The other 18 studies recruited participants from the general or rural populations. The number of cases in the 10 case–control studies ranged from 7 to 89, with a median of 27. In seven of the eight cross-sectional studies, the prevalence of infection was lower than 6%. The quality assessment of these studies is detailed in <ext-link ext-link-type="uri" xlink:href="/content/journals/10.4269/ajtmh.17-0014#supplementary_data">Supplemental text 1</ext-link>. Ten studies were assessed as being at moderate risk of bias and 14 at serious risk of bias.</p><p>All 51 practice prevalence studies were cross-sectional and conducted in 14 countries, mostly in southeast Asia (<italic>N</italic> = 25, 49%) and China (<italic>N</italic> = 11, 22%, including Hong Kong). Thirty-six studies explored poultry exposure practices in households, whereas practices adopted by poultry market, farm, and/or abattoir workers were explored in 15 studies. All but three studies explored practices using standardized questionnaires. The remaining three studies, conducted in Bangladesh, used observations and in-depth interviews. Sample sizes were highly variable, ranging from 34 to 4950, with a median of 312. We classified 21 studies as Quality 1 and 30 studies as Quality 2 (<ext-link ext-link-type="uri" xlink:href="/content/journals/10.4269/ajtmh.17-0014#supplementary_data">Supplemental Table 8</ext-link>).</p></sec><sec id="sec8"><title>Association between poultry exposure practices and AIV infection.</title><p>Study-specific and pooled ORs for each poultry exposure practice explored in the included case–control, cohort, and cross-sectional studies are shown in <xref ref-type="fig" rid="f2">Figures 2</xref>–<xref ref-type="fig" rid="f5">5</xref> (detailed exposures in <ext-link ext-link-type="uri" xlink:href="/content/journals/10.4269/ajtmh.17-0014#supplementary_data">Supplemental Table 12</ext-link>).</p><fig id="f2" position="float"><label>Figure 2.</label><caption><p>Association between human AIV infection and indirect exposure to poultry in various locations. HH = Household; NS = not specified; Prem = premises, include farms, markets and abattoirs; non-adj OR= odds ratio is not adjusted for other exposure practices; adj OR = odds ratio is adjusted for other exposure practices; not reported = multivariate analysis was conducted but adjusted OR was not reported for the practice of interest. This figure appears in color at <ext-link ext-link-type="uri" xlink:href="http://www.ajtmh.org">www.ajtmh.org</ext-link>.</p></caption><graphic xlink:href="tpmd170014f2"></graphic></fig><fig id="f3" position="float"><label>Figure 3.</label><caption><p>Association between human AIV infection and practices resulting in indirect exposure. HH = household; NS = not specified; Prem = premises, include farms, markets and abattoirs; non-adj OR = odds ratio is not adjusted for other exposure practices; adj OR = odds ratio is adjusted for other exposure practices; not reported = multivariate analysis was conducted but adjusted OR was not reported for the practice of interest. This figure appears in color at <ext-link ext-link-type="uri" xlink:href="http://www.ajtmh.org">www.ajtmh.org</ext-link>.</p></caption><graphic xlink:href="tpmd170014f3"></graphic></fig><fig id="f4" position="float"><label>Figure 4.</label><caption><p>Association between human AIV infection and practices resulting in direct exposure. HH = household; NS = not specified; Prem = premises, include farms, markets and abattoirs; non-adj OR = odds ratio is not adjusted for other exposure practices; adj OR = odds ratio is adjusted for other exposure practices; not reported = multivariate analysis was conducted but adjusted OR was not reported for the practice of interest. This figure appears in color at <ext-link ext-link-type="uri" xlink:href="http://www.ajtmh.org">www.ajtmh.org</ext-link>.</p></caption><graphic xlink:href="tpmd170014f4"></graphic></fig><fig id="f5" position="float"><label>Figure 5.</label><caption><p>Association between human AIV infection and preventive practices. HH = household; NS = not specified; Prem = premises, include farms, markets and abattoirs; non-adj OR = odds ratio is not adjusted for other exposure practices; adj OR = odds ratio is adjusted for other exposure practices; not reported = multivariate analysis was conducted but adjusted OR was not reported for the practice of interest. This figure appears in color at <ext-link ext-link-type="uri" xlink:href="http://www.ajtmh.org">www.ajtmh.org</ext-link>.</p></caption><graphic xlink:href="tpmd170014f5"></graphic></fig><sec id="sec9"><title>Indirect exposure.</title><p>Indirect exposure to poultry was generally expressed as the co-occurrence of poultry and study participants in a given environment: within the neighborhood, at home, in a LBM, or at the worksite. Poultry could be described as healthy, sick, or dead. The evidence for an association between infection and presence of poultry in backyard or commercial farms in the vicinity of study participants' homes was variable across studies (<xref ref-type="fig" rid="f2">Figure 2</xref>). Meta-analysis results suggested that the presence of poultry at home substantially increased the odds of infection by H5N1 (pooled OR = 3, 95% CI = 1.7–5.5) and H7N9 (pooled OR = 3.6, 95% CI = 1.4–8.9). Heterogeneity was, however, large among H7N9 studies (<italic>I</italic><sup>2</sup> = 69%). Odds of infection were even further increased if poultry raised at home became sick or died (H5N1, pooled OR = 9.5, 95% CI = 5.1–17.8).</p><p>Occupational exposure to poultry was explored in only three studies, of which two suggested an association with human infection.<xref rid="ref21" ref-type="bibr"><sup>21</sup></xref><sup>,</sup><xref rid="ref26" ref-type="bibr"><sup>26</sup></xref> Visits to LBMs were associated with infection in all studies reporting such exposure. The pooled OR estimate for H7N9 infection was 5.2 (95% CI = 3.6–7.3) and for H5N1 3.5 (95% CI = 1.7–7). These results were in agreement with ecological study findings (<ext-link ext-link-type="uri" xlink:href="/content/journals/10.4269/ajtmh.17-0014#supplementary_data">Supplemental Table 6</ext-link>). H5N1 infection in Indonesia was associated with the occurrence of poultry outbreaks in the same area (RR = 1.3, 95% CI = 1.1–17).<xref rid="ref24" ref-type="bibr"><sup>24</sup></xref> Two studies found an association between H7N9 cases and the density of LBMs,<xref rid="ref36" ref-type="bibr"><sup>36</sup></xref><sup>,</sup><xref rid="ref37" ref-type="bibr"><sup>37</sup></xref> whereas two others noted a drastic reduction in H7N9 incidence with LBM closure.<xref rid="ref35" ref-type="bibr"><sup>35</sup></xref><sup>,</sup><xref rid="ref38" ref-type="bibr"><sup>38</sup></xref></p><p>Increase in the odds of infection with the proximity between poultry and humans, the size of the susceptible poultry population, and the frequency of exposure was further suggested through the exploration of additional variables (<ext-link ext-link-type="uri" xlink:href="/content/journals/10.4269/ajtmh.17-0014#supplementary_data">Supplemental Table 7</ext-link>). Keeping poultry cages inside rather than outside the home<xref rid="ref21" ref-type="bibr"><sup>21</sup></xref> and raising larger backyard<xref rid="ref28" ref-type="bibr"><sup>28</sup></xref> and commercial<xref rid="ref29" ref-type="bibr"><sup>29</sup></xref> flocks with suboptimal vaccination coverage<xref rid="ref21" ref-type="bibr"><sup>21</sup></xref> increased the odds of infection.</p><p>In three studies, ORs were shown to increase with the frequency of visits to LBMs.<xref rid="ref21" ref-type="bibr"><sup>21</sup></xref><sup>,</sup><xref rid="ref31" ref-type="bibr"><sup>31</sup></xref><sup>,</sup><xref rid="ref34" ref-type="bibr"><sup>34</sup></xref> The effect of occupational exposure was found to further vary with premise type: breeder and layer farms were at higher risk for their employees than other farm types in two studies,<xref rid="ref40" ref-type="bibr"><sup>40</sup></xref><sup>,</sup><xref rid="ref41" ref-type="bibr"><sup>41</sup></xref> whereas working in retail markets was riskier than in wholesale markets and farms in another study.<xref rid="ref26" ref-type="bibr"><sup>26</sup></xref></p><p>Regarding poultry species, there was weak evidence in one study that the OR of H5N1 infection was higher when raising waterfowl at home than when raising chickens only.<xref rid="ref21" ref-type="bibr"><sup>21</sup></xref> In one study, exposure to geese and turkeys, respectively, increased the odds of H5N1 infection, whereas exposure to ducks increased the odds of H9 infection.<xref rid="ref30" ref-type="bibr"><sup>30</sup></xref> However, the odds of H9 infection were not different as between duck and chicken keepers in another study<xref rid="ref42" ref-type="bibr"><sup>42</sup></xref> (<ext-link ext-link-type="uri" xlink:href="/content/journals/10.4269/ajtmh.17-0014#supplementary_data">Supplemental Table 7</ext-link>).</p><p>Only seven out of the 19 case–control, cohort, and cross-sectional studies described specific activities leading to indirect exposures. Most studies found weak evidence of association between infection and poultry husbandry-related activities (<xref ref-type="fig" rid="f3">Figure 3</xref>). Feeding poultry in farms, witnessing poultry slaughter in markets, and storing products from sick/dead poultry at home were found to be associated with H5N1 infection, each of them in one study. Some investigated activities were unrelated to poultry management but to contact with water potentially contaminated by poultry. Although pooled OR estimates revealed weak evidence of an association between H5N1 infection and the use of outdoor water (pooled OR = 2.5, 95% CI = 0.5–12.1), the evidence was stronger for bathing in water bodies (pooled OR = 3.1, 95% CI = 1.5–6.4).</p></sec><sec id="sec10"><title>Direct exposure.</title><p>As with indirect exposure, direct exposure to poultry was often described in general terms as direct contact with, touching or handling poultry. Meta-analysis suggested an association between handling poultry and infection (<xref ref-type="fig" rid="f4">Figure 4</xref>). Heterogeneity was high among studies and could not only be explained by the diversity of settings, as the level of heterogeneity was not reduced when only considering households (<ext-link ext-link-type="uri" xlink:href="/content/journals/10.4269/ajtmh.17-0014#supplementary_data">Supplemental Table 3</ext-link>). This association seemed slightly stronger for H7N9 (pooled OR = 5.5, 95% CI = 2.3–13.1) than H5N1 (pooled OR = 2.8, 95% CI = 1.1–7.4), and when sick or dead poultry were concerned (H5N1, pooled OR = 4.8, 95% CI = 1.2–19.2). However, handling poultry did not seem to result in higher odds of infection than indirect exposure at home or in markets.</p><p>The investigated activities resulting in direct exposure to poultry were related to poultry husbandry, processing, and consumption (<xref ref-type="fig" rid="f4">Figure 4</xref>). While consumption of healthy-appearing or sick poultry was not associated with H5N1 or H7N9 infection, several stages of poultry processing—such as slaughtering, evisceration, and preparation—were found in the meta-analysis to increase the odds of H5N1 infection. Regarding poultry husbandry practices, vaccinating and handling birds to place them into cages were found associated with H9 and H5N1 infection in two different studies. Although a study found weak evidence for higher odds of H9 infection among chicken butchers than keepers (OR = 3.4, 95% CI: 0.8–14.5),<xref rid="ref42" ref-type="bibr"><sup>42</sup></xref> the small number of studies for each processing and husbandry activity, and the often high level of heterogeneity among them limit the comparisons that can be performed across activities, viral subtypes and poultry health status.</p></sec><sec id="sec11"><title>Protective factors.</title><p>Regarding hygiene practices (<xref ref-type="fig" rid="f5">Figure 5</xref>), meta-analysis provided weak evidence for frequent handwashing being a protective factor (H5N1 pooled OR = 0.5, 95% CI = 0.2–1.3; H7N9 pooled OR = 0.2, 95% CI = 0–1.2). Only one study examined use of masks and frequent disinfection of worksites (e.g., farms). It noted a reduced odds of infection (ORs = 0.1, 95% CI = 0–1 and ORs = 0.1, 95% CI = 0–0.6, respectively).<xref rid="ref41" ref-type="bibr"><sup>41</sup></xref></p></sec></sec><sec id="sec12"><title>Prevalence of poultry exposure practices.</title><p>Exposure to live birds was widespread in studied populations (detailed prevalences in <ext-link ext-link-type="uri" xlink:href="/content/journals/10.4269/ajtmh.17-0014#supplementary_data">Supplemental Table 9</ext-link>). Although the proportion of households raising backyard poultry was higher in rural than in peri-urban and urban areas, purchasing live poultry in markets was more frequent in peri-urban and urban rather than rural settings (<xref ref-type="table" rid="t2">Table 2</xref>, <ext-link ext-link-type="uri" xlink:href="/content/journals/10.4269/ajtmh.17-0014#supplementary_data">Supplemental Figures 1</ext-link> and <ext-link ext-link-type="uri" xlink:href="/content/journals/10.4269/ajtmh.17-0014#supplementary_data">2</ext-link>). Levels of contact with poultry at markets and households greatly varied across studies: the proportion of households keeping poultry inside their own house ranged from 1% to 87% (<xref ref-type="table" rid="t2">Table 2</xref>), and the proportion of households slaughtering birds at home ranged from 12% to 85% (<xref ref-type="table" rid="t3">Table 3</xref>, <ext-link ext-link-type="uri" xlink:href="/content/journals/10.4269/ajtmh.17-0014#supplementary_data">Supplemental Figure 3</ext-link>). The proportion of respondents who reported touching poultry when purchasing it in markets was lower than 18% in the three surveys conducted in Hong Kong, whereas it was higher than 58% in five of six surveys conducted in mainland China, Viet Nam, and Thailand (<ext-link ext-link-type="uri" xlink:href="/content/journals/10.4269/ajtmh.17-0014#supplementary_data">Supplemental Figure 2</ext-link>).</p><table-wrap id="t2" position="float"><label>Table 2</label><caption><p>Prevalence of practices related to backyard poultry rearing and purchase of poultry in LBMs</p></caption><table frame="hsides" rules="groups"><thead><tr><th rowspan="1" colspan="1"></th><th align="center" colspan="3" rowspan="1">All households<hr></hr></th><th align="center" colspan="3" rowspan="1">Urban households<hr></hr></th><th align="center" colspan="3" rowspan="1">Peri-urban households<hr></hr></th><th align="center" colspan="3" rowspan="1">Rural households<hr></hr></th></tr><tr><th rowspan="1" colspan="1"></th><th align="center" rowspan="1" colspan="1"><italic>n</italic> (c)</th><th align="center" rowspan="1" colspan="1">p (range)</th><th align="center" rowspan="1" colspan="1"><italic>I</italic><sup>2</sup></th><th align="center" rowspan="1" colspan="1"><italic>n</italic> (c)</th><th align="center" rowspan="1" colspan="1">p (range)</th><th align="center" rowspan="1" colspan="1"><italic>I</italic><sup>2</sup></th><th align="center" rowspan="1" colspan="1"><italic>n</italic> (c)</th><th align="center" rowspan="1" colspan="1">p (range)</th><th align="center" rowspan="1" colspan="1"><italic>I</italic><sup>2</sup></th><th align="center" rowspan="1" colspan="1"><italic>n</italic> (c)</th><th align="center" rowspan="1" colspan="1">p (range)</th><th align="center" rowspan="1" colspan="1"><italic>I</italic><sup>2</sup></th></tr></thead><tbody><tr><td rowspan="1" colspan="1">Raise backyard poultry</td><td align="char" char="(" rowspan="1" colspan="1">24 (10)</td><td rowspan="1" colspan="1">65 (19–96)</td><td align="char" char="." rowspan="1" colspan="1">99</td><td align="center" rowspan="1" colspan="1">4 (3)</td><td align="center" rowspan="1" colspan="1">45 (19–51)</td><td align="char" char="." rowspan="1" colspan="1">98</td><td align="char" char="." rowspan="1" colspan="1">3 (2)</td><td rowspan="1" colspan="1">50 (34–55)</td><td align="center" rowspan="1" colspan="1">91</td><td align="char" char="(" rowspan="1" colspan="1">15 (9)</td><td align="char" char="(" rowspan="1" colspan="1">78 (50–96)</td><td align="char" char="." rowspan="1" colspan="1">98</td></tr><tr><td rowspan="1" colspan="1">Keep poultry inside house</td><td align="char" char="(" rowspan="1" colspan="1">6 (4)</td><td rowspan="1" colspan="1">20 (1–87)</td><td align="char" char="." rowspan="1" colspan="1">100</td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td rowspan="1" colspan="1">Visit LBMs to purchase poultry</td><td align="char" char="(" rowspan="1" colspan="1">11 (4)</td><td rowspan="1" colspan="1">38 (7–81)</td><td align="char" char="." rowspan="1" colspan="1">100</td><td align="center" rowspan="1" colspan="1">3 (1)</td><td align="center" rowspan="1" colspan="1">38 (33–81)</td><td align="char" char="." rowspan="1" colspan="1">100</td><td align="char" char="." rowspan="1" colspan="1">1 (1)</td><td rowspan="1" colspan="1">77</td><td align="center" rowspan="1" colspan="1">–</td><td align="char" char="(" rowspan="1" colspan="1">3 (1)</td><td align="char" char="(" rowspan="1" colspan="1">8 (7–9)</td><td align="char" char="." rowspan="1" colspan="1">0</td></tr><tr><td rowspan="1" colspan="1">Touch when purchasing</td><td align="char" char="(" rowspan="1" colspan="1">9 (4)</td><td rowspan="1" colspan="1">59 (5–92)</td><td align="char" char="." rowspan="1" colspan="1">100</td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr></tbody></table><table-wrap-foot><fn id="tblfn2"><p>LBM = live bird market; <italic>n</italic> (c) = number of studies along with the number of countries in which these studies took place in brackets; p (range) = median prevalence (%) and range.</p></fn></table-wrap-foot></table-wrap><table-wrap id="t3" position="float"><label>Table 3</label><caption><p>Prevalence of preventive practices and practices related to the slaughtering and processing of poultry, and the management of sick and dead poultry</p></caption><table frame="hsides" rules="groups"><thead><tr><th rowspan="1" colspan="1"></th><th align="center" colspan="3" rowspan="1">Households<hr></hr></th><th align="center" colspan="3" rowspan="1">Premises<hr></hr></th><th align="center" colspan="3" rowspan="1">Farms<hr></hr></th><th align="center" colspan="3" rowspan="1">Live bird markets<hr></hr></th></tr><tr><th rowspan="1" colspan="1"></th><th align="center" rowspan="1" colspan="1"><italic>n</italic> (c)</th><th align="center" rowspan="1" colspan="1">p (range)</th><th align="center" rowspan="1" colspan="1"><italic>I</italic><sup>2</sup></th><th align="center" rowspan="1" colspan="1"><italic>n</italic> (c)</th><th align="center" rowspan="1" colspan="1">p (range)</th><th align="center" rowspan="1" colspan="1"><italic>I</italic><sup>2</sup></th><th align="center" rowspan="1" colspan="1"><italic>n</italic> (c)</th><th align="center" rowspan="1" colspan="1">p (range)</th><th align="center" rowspan="1" colspan="1"><italic>I</italic><sup>2</sup></th><th align="center" rowspan="1" colspan="1"><italic>n</italic> (c)</th><th align="center" rowspan="1" colspan="1">p (range)</th><th align="center" rowspan="1" colspan="1"><italic>I</italic><sup>2</sup></th></tr></thead><tbody><tr><td rowspan="1" colspan="1">Slaughtering and processing poultry</td><td align="char" char="(" rowspan="1" colspan="1">11 (7)</td><td align="char" char="(" rowspan="1" colspan="1">45 (12–85)</td><td align="char" char="." rowspan="1" colspan="1">99</td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td align="char" char="(" rowspan="1" colspan="1">2 (2)</td><td align="char" char="(" rowspan="1" colspan="1">22 (6–38)</td><td align="char" char="." rowspan="1" colspan="1">98</td><td align="char" char="(" rowspan="1" colspan="1">4 (4)</td><td align="char" char="(" rowspan="1" colspan="1">73 (39–100)</td><td align="char" char="." rowspan="1" colspan="1">98</td></tr><tr><td rowspan="1" colspan="1">Management of sick and dead poultry</td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td rowspan="1" colspan="1">Touching</td><td align="char" char="(" rowspan="1" colspan="1">9 (3)</td><td align="char" char="(" rowspan="1" colspan="1">33 (14–75)</td><td align="char" char="." rowspan="1" colspan="1">99</td><td align="char" char="(" rowspan="1" colspan="1">2 (1)</td><td align="char" char="(" rowspan="1" colspan="1">11 (8–13)</td><td align="char" char="." rowspan="1" colspan="1">86</td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td align="char" char="(" rowspan="1" colspan="1">1 (1)</td><td rowspan="1" colspan="1">41</td><td align="center" rowspan="1" colspan="1">–</td></tr><tr><td rowspan="1" colspan="1">Consumption</td><td align="char" char="(" rowspan="1" colspan="1">13 (6)</td><td align="char" char="(" rowspan="1" colspan="1">12 (2–100)</td><td align="char" char="." rowspan="1" colspan="1">99</td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td align="char" char="(" rowspan="1" colspan="1">1 (1)</td><td rowspan="1" colspan="1">16</td><td align="center" rowspan="1" colspan="1">–</td></tr><tr><td rowspan="1" colspan="1">Selling</td><td align="char" char="(" rowspan="1" colspan="1">7 (6)</td><td align="char" char="(" rowspan="1" colspan="1">26 (0–100)</td><td align="char" char="." rowspan="1" colspan="1">99</td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td align="char" char="(" rowspan="1" colspan="1">1 (1)</td><td rowspan="1" colspan="1">81</td><td align="center" rowspan="1" colspan="1">–</td><td align="char" char="(" rowspan="1" colspan="1">2 (2)</td><td align="char" char="(" rowspan="1" colspan="1">28 (2–53)</td><td align="char" char="(" rowspan="1" colspan="1">99</td></tr><tr><td rowspan="1" colspan="1">Returning to suppliers</td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td align="char" char="(" rowspan="1" colspan="1">1 (1)</td><td rowspan="1" colspan="1">50</td><td align="center" rowspan="1" colspan="1">–</td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td align="char" char="(" rowspan="1" colspan="1">1 (1)</td><td rowspan="1" colspan="1">9</td><td align="center" rowspan="1" colspan="1">–</td></tr><tr><td rowspan="1" colspan="1">Throwing in open spaces</td><td align="char" char="(" rowspan="1" colspan="1">11 (7)</td><td align="char" char="(" rowspan="1" colspan="1">45 (2–87)</td><td align="char" char="." rowspan="1" colspan="1">99</td><td align="char" char="(" rowspan="1" colspan="1">1 (1)</td><td rowspan="1" colspan="1">20</td><td align="center" rowspan="1" colspan="1">–</td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td rowspan="1" colspan="1">Burying/Incinerating</td><td align="char" char="(" rowspan="1" colspan="1">13 (8)</td><td align="char" char="(" rowspan="1" colspan="1">72 (2–95)</td><td align="char" char="." rowspan="1" colspan="1">99</td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td align="char" char="(" rowspan="1" colspan="1">2 (2)</td><td align="char" char="(" rowspan="1" colspan="1">62 (30–95)</td><td align="char" char="." rowspan="1" colspan="1">99</td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td rowspan="1" colspan="1">Preventive practices</td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td rowspan="1" colspan="1">Washing hands with soap after contacts with poultry</td><td align="char" char="(" rowspan="1" colspan="1">6 (4)</td><td align="char" char="(" rowspan="1" colspan="1">97 (4–99)</td><td align="char" char="." rowspan="1" colspan="1">96</td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td align="char" char="." rowspan="1" colspan="1">1 (1)</td><td rowspan="1" colspan="1">68</td><td align="center" rowspan="1" colspan="1">–</td></tr><tr><td rowspan="1" colspan="1">Wearing gloves</td><td align="char" char="(" rowspan="1" colspan="1">3 (3)</td><td align="char" char="(" rowspan="1" colspan="1">2 (1–2)</td><td align="char" char="." rowspan="1" colspan="1">0</td><td align="char" char="(" rowspan="1" colspan="1">2 (1)</td><td align="char" char="(" rowspan="1" colspan="1">51 (47–54)</td><td align="char" char="." rowspan="1" colspan="1">81</td><td align="char" char="(" rowspan="1" colspan="1">4 (4)</td><td align="char" char="(" rowspan="1" colspan="1">18 (1–30)</td><td align="char" char="." rowspan="1" colspan="1">90</td><td align="char" char="(" rowspan="1" colspan="1">1 (1)</td><td rowspan="1" colspan="1">60</td><td align="center" rowspan="1" colspan="1">–</td></tr><tr><td rowspan="1" colspan="1">Wearing facemask</td><td align="char" char="(" rowspan="1" colspan="1">4 (3)</td><td align="char" char="(" rowspan="1" colspan="1">2 (0–2)</td><td align="char" char="." rowspan="1" colspan="1">0</td><td align="char" char="(" rowspan="1" colspan="1">2 (1)</td><td align="char" char="(" rowspan="1" colspan="1">44 (42–46)</td><td align="char" char="." rowspan="1" colspan="1">37</td><td align="char" char="(" rowspan="1" colspan="1">4 (4)</td><td align="char" char="(" rowspan="1" colspan="1">21 (6–66)</td><td align="char" char="." rowspan="1" colspan="1">98</td><td align="char" char="(" rowspan="1" colspan="1">4 (4)</td><td align="char" char="(" rowspan="1" colspan="1">18 (13–45)</td><td align="char" char="." rowspan="1" colspan="1">93</td></tr><tr><td rowspan="1" colspan="1">Wearing aprons/changing clothes</td><td align="char" char="(" rowspan="1" colspan="1">2 (2)</td><td align="char" char="(" rowspan="1" colspan="1">3 (0–5)</td><td align="char" char="." rowspan="1" colspan="1">0</td><td align="char" char="(" rowspan="1" colspan="1">1 (1)</td><td rowspan="1" colspan="1">89</td><td align="center" rowspan="1" colspan="1">–</td><td align="char" char="(" rowspan="1" colspan="1">3 (3)</td><td align="char" char="(" rowspan="1" colspan="1">4 (3–34)</td><td align="char" char="." rowspan="1" colspan="1">94</td><td align="char" char="(" rowspan="1" colspan="1">4 (2)</td><td align="char" char="(" rowspan="1" colspan="1">42 (15–80)</td><td align="char" char="." rowspan="1" colspan="1">96</td></tr><tr><td rowspan="1" colspan="1">Wearing boots</td><td align="char" char="(" rowspan="1" colspan="1">1 (1)</td><td rowspan="1" colspan="1">6</td><td align="center" rowspan="1" colspan="1">–</td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td align="char" char="(" rowspan="1" colspan="1">3 (3)</td><td align="char" char="(" rowspan="1" colspan="1">15 (7–16)</td><td align="char" char="." rowspan="1" colspan="1">6</td><td align="char" char="(" rowspan="1" colspan="1">4 (2)</td><td align="char" char="(" rowspan="1" colspan="1">60 (30–80)</td><td align="char" char="." rowspan="1" colspan="1">92</td></tr><tr><td rowspan="1" colspan="1">Rinsing/washing equipment after use</td><td align="char" char="(" rowspan="1" colspan="1">2 (2)</td><td align="char" char="(" rowspan="1" colspan="1">66 (33–99)</td><td align="char" char="." rowspan="1" colspan="1">98</td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td align="char" char="(" rowspan="1" colspan="1">1 (1)</td><td rowspan="1" colspan="1">41</td><td align="center" rowspan="1" colspan="1">–</td><td align="char" char="(" rowspan="1" colspan="1">4 (1)</td><td align="char" char="(" rowspan="1" colspan="1">50 (19–100)</td><td align="char" char="." rowspan="1" colspan="1">97</td></tr></tbody></table><table-wrap-foot><fn id="tblfn3"><p><italic>n</italic> (c) = number of studies along with the number of countries in which these studies took place in brackets; p (range) = median prevalence (%) and range. Premises include farms, markets, and abattoirs.</p></fn></table-wrap-foot></table-wrap><p>The surveyed populations were highly heterogeneous in terms of their management of sick and dead poultry (<xref ref-type="table" rid="t3">Table 3</xref>). In Bangladesh, Egypt and, to a lesser extent, Cambodia, the proportion of survey participants burying or incinerating dead poultry was generally lower and the proportion consuming, selling, or throwing sick or dead poultry into open spaces was generally higher when compared with other study sites (including China, India, Indonesia, Lao, Thailand, and Viet Nam) (<ext-link ext-link-type="uri" xlink:href="/content/journals/10.4269/ajtmh.17-0014#supplementary_data">Supplemental Figure 4</ext-link>).</p><p>The proportion of household survey participants reporting handwashing with soap after contact with poultry was higher than 80% in all studies exploring this practice, except in one study in Bangladesh where the proportion dropped to 4%. The adoption of PPE was higher among farm and market workers than in households. However, most workers generally reported not wearing PPE (<ext-link ext-link-type="uri" xlink:href="/content/journals/10.4269/ajtmh.17-0014#supplementary_data">Supplemental Figure 5</ext-link>).</p><p>Some additional practices were reported by only a couple of studies, including practices exposing humans to potentially contaminated environments. This included cleaning places where poultry are kept, bathing in water bodies in Cambodia, washing carcasses in water bodies in Cambodia and Bangladesh, and barefoot contact with blood in Bangladesh.</p></sec><sec id="sec13"><title>Rationale for poultry exposure practices.</title><p>None of the reviewed studies sought to explore the rationales behind practices at risk of human exposure to AIVs. Eight practice prevalence studies did address some of the reasons for conducting some practices, but not comprehensively (<ext-link ext-link-type="uri" xlink:href="/content/journals/10.4269/ajtmh.17-0014#supplementary_data">Supplemental Table 10</ext-link>). Other studies discussed these rationales as post hoc hypotheses (<ext-link ext-link-type="uri" xlink:href="/content/journals/10.4269/ajtmh.17-0014#supplementary_data">Supplemental Table 11</ext-link>). However, exploring rationales requires targeted research and in none of the papers were these dealt with according to the canons of social anthropology and ethnography.</p><p>The eight prevalence studies, in which reasons for some practices were briefly discussed, took place in Bangladesh, Egypt, Indonesia, Lao, and Turkey. In Bangladesh, backyard farmers reported keeping poultry in their bedroom because they are concerned about predation and thieves.<xref rid="ref43" ref-type="bibr"><sup>43</sup></xref> Some kept sick poultry in their bedroom to separate them from their healthy poultry and to keep them under observation.<xref rid="ref44" ref-type="bibr"><sup>44</sup></xref> This practice was related to the perception that people are not at risk of illness. Some people may have been aware of avian influenza, but they considered the risks associated with poultry handling as negligible. Moreover, several practices were described by the authors as a matter of preference, rooted in tradition (based on interviews of residents or developed as post hoc hypotheses).<xref rid="ref45" ref-type="bibr"><sup>45</sup></xref> For instance, live poultry bought in markets were preferred to chilled or frozen meat for consumption as the latter was considered to be of lower quality.<xref rid="ref46" ref-type="bibr"><sup>46</sup></xref> Poultry slaughtered immediately before cooking were traditionally believed to be fresher, more flavorsome and nutritious, and less likely to be contaminated.<xref rid="ref47" ref-type="bibr"><sup>47</sup></xref> Likewise, reasons for touching poultry before buying were related to consumer traditions, relying on their own judgment of the quality and safety of the poultry.<xref rid="ref47" ref-type="bibr"><sup>47</sup></xref> Authors also related the adoption of certain risky practices to poverty. High poultry prices meant that purchasing poultry meat was not affordable for the poorest, and thereby encouraged the consumption of sick or dead poultry.<xref rid="ref44" ref-type="bibr"><sup>44</sup></xref><sup>,</sup><xref rid="ref47" ref-type="bibr"><sup>47</sup></xref><sup>,</sup><xref rid="ref48" ref-type="bibr"><sup>48</sup></xref></p><p>The non-adoption of preventive measures was mainly explained by authors by financial constraints, such as implementation costs and potential impact on business, absence of supporting legislation, time and space constraints, and “risk fatigue” from repeated outbreaks.<xref rid="ref45" ref-type="bibr"><sup>45</sup></xref><sup>,</sup><xref rid="ref49" ref-type="bibr"><sup>49</sup></xref><sup>–</sup><xref rid="ref52" ref-type="bibr"><sup>52</sup></xref> This is generally analyzed in the context of poor populations that do not consider avian influenza to be a major health threat, and for whom the perceived chance of an adverse outcome from poultry exposure is considered to be relatively low compared with the adverse outcome of worsening poverty.</p><p>Heterogeneity in practices across settings was often explained by authors by differing religious beliefs. In Bangladesh, sick poultry were slaughtered and consumed if it was thought that they were about to die because of religious bans on eating animals that die of natural causes.<xref rid="ref44" ref-type="bibr"><sup>44</sup></xref><sup>,</sup><xref rid="ref48" ref-type="bibr"><sup>48</sup></xref> In contrast, consumption of dead poultry was reported in non-Muslim populations. According to Buddhist principles, killing is considered to have karmic consequences. Thai people were therefore considered to be less likely to slaughter poultry themselves.<xref rid="ref47" ref-type="bibr"><sup>47</sup></xref></p></sec></sec><sec id="sec14"><title>Discussion</title><p>Both direct and indirect exposures to poultry in households, farms, or markets were associated with human infection by AIVs in most of the reviewed risk factor studies. The strength of this association seemed stronger for H7N9 than for H5N1, for sick and dead compared with healthy poultry, and in markets compared with any other setting. Several studies also suggested that the odds of infection further increased with the proximity between humans and poultry, the size of the poultry population to which humans were exposed, and the frequency of exposure. Direct exposure was not associated with higher odds of infection than indirect exposure. This apparent association between AIV infection and indirect exposure to poultry, and the possible role of handwashing and environmental disinfection as protective factors suggest that contacts with contaminated environments followed by ingestion, intranasal or conjunctival self-inoculation of the virus may be a major mode of AIV transmission. Infected poultry shed a high viral load, which may survive in the environment for a few days under favorable conditions.<xref rid="ref53" ref-type="bibr"><sup>53</sup></xref> In households, virus survival in the environment may represent an infection pressure to which people may have prolonged contact, in particular when poultry are kept inside home, including in bedrooms. Even when environmental exposure is of a shorter duration, such as in the case of people visiting markets, the frequent introduction of infected poultry in markets and the associated viral circulation among marketed poultry<xref rid="ref54" ref-type="bibr"><sup>54</sup></xref> means that humans may be exposed to high virus loads. However, high uncertainty remains regarding the actual modes of transmission involved. Contributions of aerosols and large droplets cannot be ruled out, as investigated exposures may be associated with several modes of transmission.<xref rid="ref55" ref-type="bibr"><sup>55</sup></xref> H5N1 was shown to be transmitted between poultry by aerosols.<xref rid="ref56" ref-type="bibr"><sup>56</sup></xref> Some practices, such as mechanical defeathering, may generate contaminated aerosols and large droplets, and result in the infection of people visiting markets.<xref rid="ref57" ref-type="bibr"><sup>57</sup></xref> These results suggest that interventions aiming to reduce virus load in markets,<xref rid="ref58" ref-type="bibr"><sup>58</sup></xref> and behavioral change strategies leading to higher biosafety standards when handling poultry, especially sick or dead specimens, could substantially reduce human exposure to AIVs. The adoption of risky and protective practices varied greatly across studies, and was frequently explained as motivated by financial constraints and religious beliefs. These variations could also result from temporal changes in people's perception of their risk of infection. As these factors were expected to vary across the heterogeneous socioeconomic and cultural landscape covered by the reviewed articles, risk mitigation interventions should be tailored to these local contexts. However, none of the studies reviewed here aimed to assess the rationale behind practices at risk of human exposure to AIVs. Reviewed knowledge, attitude, and practice studies investigated questions related to awareness and knowledge, and a few studies did touch on some reasons behind specific practices and discussed these as post hoc hypotheses, but neither in sufficient detail nor at the appropriate level of conceptualization.</p></sec><sec id="sec15"><title>Limitations</title><p>Our review was exposed to recall bias, as exposures were captured in all risk factor studies, and most practice prevalence studies, through structured interviews of study participants, or proxies when study participants have died. Bias in the measurement of exposures was more pronounced in risk factor studies using serology to define prevalent cases: AIVs being endemic in most settings, there was uncertainty about whether the reported exposures preceded, or not, the infection. However, this bias might be limited as most investigated exposures were daily, routine practices, which might not greatly change in the medium-term in AIV-endemic settings.</p><p>The use of structured interviews to measure exposure in all risk factor studies and most practice prevalence studies implied further limitations. Although the observed heterogeneity in the prevalence of practices was generally explained, as mentioned earlier, by variations in socioeconomic and cultural landscapes, this pattern could also result from the limited representativeness induced by the geographically small study sites, and response bias. Asking about past behavior or about practices that may be officially banned or enforced by regulation, or of which their adoption may be positively or negatively perceived by people may in addition result in biased answers, leading to an underestimation of the real levels of exposure. For instance, high compliance to handwashing was reported in all questionnaire surveys that investigated this practice, but it was only actually done by a small proportion of participants observed in one study.<xref rid="ref48" ref-type="bibr"><sup>48</sup></xref> Moreover, structured questionnaire surveys can only investigate the adoption of practices of which the study designers have an awareness. For instance, several practice prevalence studies explored whether participants wear boots dedicated to the care of poultry. Based on observations of poultry rearing by Bangladeshi rural communities, one study was able to identify that people stepped barefoot into poultry blood.<xref rid="ref43" ref-type="bibr"><sup>43</sup></xref> Stepping barefoot in poultry blood might be a more relevant practice than the failure to wear special boots dedicated to poultry care.</p><p>The pooled OR estimates often relied on a small number of heterogeneous studies, and, therefore, need to be interpreted with caution. Also, terms used to refer to practices were often only merely named or briefly described. The same term could have different uses, and therefore, different meanings across studies. Multiple specific practices may have been encompassed within these descriptions. Only a few specific practices were investigated, but the frequency and intensity of contact were not detailed, preventing further discrimination of practices according to the degree of exposure to poultry. Overall, investigated practices—or their descriptions in the literature which are not the same as the practices themselves—appear not to have changed significantly within the last 17 years. Investigations have yet to be comprehensive, in-depth analyses of given and related practices. For example, while visiting live bird markets was found to be a risk factor for AIV infection in the first risk factor study in 1997, subsequent studies were rarely able to explore in more detail which types of practices within markets could lead to infection, given the retrospective nature of outbreak investigations.</p></sec><sec id="sec16"><title>Future Research</title><p>To address these limitations, epidemiological surveys could benefit from being combined with anthropological investigations. Anthropological studies may help to identify practices that would be better described with observations and in-depth interviews to develop a more accurate and detailed understanding. Such practices may, for instance, include handwashing and the use of PPEs. Moreover, the development of structured interview protocols would greatly benefit from a prior anthropological exploration of both the conceptualization of “practices” and of practices of interest. Whether “practices” are of interest may alter in the light of more detailed description and contextualization. Practices that are not systematically investigated, but which may reveal to be of epidemiological importance, may thus be characterized. Further description of practices could include a characterization of the contacts involved, and a measure of their intensity and frequency. The more detailed and grounded into the local contexts these descriptions are, the less comparable they may be across settings characterized by heterogeneous populations. On the other hand, the more general these descriptions are, the less likely it would be possible to tailor interventions to the local contexts that shape those practices. Detailed descriptions are required to identify the most relevant practices and populations at risk that should be targeted by risk mitigation strategies. Nevertheless, the small number of cases identified in most risk factor studies may limit the exploration of the association between AIV infection and specific, detailed practices. If these practices were only adopted by a small fraction of the population, the statistical power would be low, and even if the actual association with AIV infection was strong, the measured strength of association would be uncertain.</p><p>Epidemiological studies typically investigate the most significant causal relationships between practices and the human exposure to AIVs as part of outbreak investigations and interventions to control them. Although causal relationships are difficult to identify, they nevertheless seek to achieve this by examining associations between an exposure variable and a health outcome.<xref rid="ref59" ref-type="bibr"><sup>59</sup></xref><sup>,</sup><xref rid="ref60" ref-type="bibr"><sup>60</sup></xref> However, identifying the specific practices promoting AIV transmission to humans is often not enough to improve preventive public health interventions and messages. For these messages to be heard and strategies to be adhered to by populations at risk, their design needs to be informed by a thorough understanding of the factors and theories influencing persistence of risky or preventive practices. Of use in such investigations is the rationale behind certain risky practices for exposure to disease: Why do people do what they do? Under which circumstances do they engage in risky practices? At what point do practices become habitual behavior as opposed to a conscious decision in light of the level of risk of pathogen transmission? How do these practices relate to the tradition, culture, and socioeconomic circumstances? How are these practices influenced by disease awareness and knowledge? These questions were not part of the main objectives of reviewed studies. Contextual research appeared to be merely a by-product. As mentioned earlier, practices and their rationales were often only briefly described. These “descriptions” may on closer examination, and informed by ethnographic studies, turn out to have been dealing in homogenizing “labels” rather than in “heterogenizing” “descriptions.” This is important because terms such as “fresh,” “nutritious,” “quality,” and “wholesome”, are each supported by an implicit local “theory” of these things, their importance and significance. Understanding these theories would help to tailor interventions to local circumstances (which may vary within countries), increasing their acceptance in populations at risk. A challenge to achieve this is to access the relation between individual actions and the socioeconomic and cultural environment in which those actions are situated and produced. Recent theoretical<xref rid="ref61" ref-type="bibr"><sup>61</sup></xref><sup>,</sup><xref rid="ref62" ref-type="bibr"><sup>62</sup></xref> and empirical works explored the use of emergent properties, such as “hope” or “disgust,” as quantitative variables capturing people's experiences of the social, economic, and cultural world they inhabit. In Uganda, the level of hope that a person experienced was measured and found to be associated with some known risk factors for HIV infection.<xref rid="ref63" ref-type="bibr"><sup>63</sup></xref> In India, disgust was associated with handwashing behavior.<xref rid="ref64" ref-type="bibr"><sup>64</sup></xref> Applying this approach may provide new insights about practice adoption and inform the development of preventive public health messages. Such messages would aim to alter the level of a given emergent property (e.g., “hope” and “disgust”) in the targeted population to promote the uptake of protective practices.</p><p>In conclusion, the descriptions of practices exposing humans to poultry and their shared environment are often general and with little information to aid understanding of underlying rationales, limiting their usefulness for developing effective control and preventive measures. The assessment of the prevalence of reported practices in populations at risk was also prone to biases acting to underestimate the actual level of exposure. Epidemiological surveys aiming to explore potentially infectious contacts at the human–animal interface would greatly benefit from being combined with anthropological investigations. Such an approach would not only allow a more accurate identification and detailed description of risky as well as preventive practices, but would also allow the exploration of the reasons behind these practices. This would in turn facilitate the development of preventive public health measures and messages more likely to lead to positive behavior change in targeted populations.</p></sec><sec sec-type="supplementary-material"><title>Supplementary Material</title><supplementary-material content-type="local-data" id="SD1"><p><ext-link ext-link-type="uri" xlink:href="/content/journals/10.4269/ajtmh.17-0014#supplementary_data">Supplemental Figures.</ext-link></p><media mimetype="application/pdf" mime-subtype="pdf" xlink:href="tpmd170014.SD1.pdf" id="S1" xlink:type="simple" position="anchor"></media></supplementary-material></sec></body><back><ref-list><title>REFERENCES</title><ref id="ref1"><label>1.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Webster</surname><given-names>RG</given-names></name><name><surname>Bean</surname><given-names>WJ</given-names></name><name><surname>Gorman</surname><given-names>OT</given-names></name><name><surname>Chambers</surname><given-names>TM</given-names></name><name><surname>Kawaoka</surname><given-names>Y</given-names></name></person-group>, <year>1992</year><article-title>Evolution and ecology of influenza A viruses</article-title>. <source>Microbiol Rev</source><volume>56</volume>: <fpage>152</fpage>–<lpage>179</lpage>.<pub-id pub-id-type="pmid">1579108</pub-id></mixed-citation></ref><ref id="ref2"><label>2.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Kawaoka</surname><given-names>Y</given-names></name><name><surname>Krauss</surname><given-names>S</given-names></name><name><surname>Webster</surname><given-names>RG</given-names></name></person-group>, <year>1989</year><article-title>Avian-to-human transmission of the PB1 gene of influenza A viruses in the 1957 and 1968 pandemics</article-title>. <source>J Virol</source><volume>63</volume>: <fpage>4603</fpage>–<lpage>4608</lpage>.<pub-id pub-id-type="pmid">2795713</pub-id></mixed-citation></ref><ref id="ref3"><label>3.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Smith</surname><given-names>GJ</given-names></name><etal></etal></person-group>, <year>2009</year><article-title>Origins and evolutionary genomics of the 2009 swine-origin H1N1 influenza A epidemic</article-title>. <source>Nature</source><volume>459</volume>: <fpage>1122</fpage>–<lpage>1125</lpage>.<pub-id pub-id-type="pmid">19516283</pub-id></mixed-citation></ref><ref id="ref4"><label>4.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Freidl</surname><given-names>GS</given-names></name><etal></etal></person-group>, <year>2014</year><article-title>Influenza at the animal-human interface: a review of the literature for virological evidence of human infection with swine or avian influenza viruses other than A(H5N1)</article-title>. <source>Euro Surveill</source><volume>19</volume>: <fpage>20793</fpage>.<pub-id pub-id-type="pmid">24832117</pub-id></mixed-citation></ref><ref id="ref5"><label>5.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Khan</surname><given-names>SU</given-names></name><name><surname>Anderson</surname><given-names>BD</given-names></name><name><surname>Heil</surname><given-names>GL</given-names></name><name><surname>Liang</surname><given-names>S</given-names></name><name><surname>Gray</surname><given-names>GC</given-names></name></person-group>, <year>2015</year><article-title>A systematic review and meta-analysis of the seroprevalence of influenza A(H9N2) infection among humans</article-title>. <source>J Infect Dis</source><volume>212</volume>: <fpage>562</fpage>–<lpage>569</lpage>.<pub-id pub-id-type="pmid">25712969</pub-id></mixed-citation></ref><ref id="ref6"><label>6.</label><mixed-citation publication-type="webpage"><collab collab-type="author">World Health Organization (WHO)</collab>, <year>2015</year><source>Cumulative Number of Confirmed Human Cases for Avian Influenza A(H5N1) Reported to WHO, 2003–2015</source>. <comment>Available at:</comment><ext-link ext-link-type="uri" xlink:href="http://www.who.int/influenza/human_animal_interface/EN_GIP_20150717cumulativeNumberH5N1cases.pdf?ua=1">http://www.who.int/influenza/human_animal_interface/EN_GIP_20150717cumulativeNumberH5N1cases.pdf?ua=1</ext-link>. <comment>Accessed August 13, 2015</comment>.</mixed-citation></ref><ref id="ref7"><label>7.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Li</surname><given-names>C</given-names></name><name><surname>Hatta</surname><given-names>M</given-names></name><name><surname>Nidom</surname><given-names>CA</given-names></name><name><surname>Muramoto</surname><given-names>Y</given-names></name><name><surname>Watanabe</surname><given-names>S</given-names></name><name><surname>Neumann</surname><given-names>G</given-names></name><name><surname>Kawaoka</surname><given-names>Y</given-names></name></person-group>, <year>2010</year><article-title>Reassortment between avian H5N1 and human H3N2 influenza viruses creates hybrid viruses with substantial virulence</article-title>. <source>Proc Natl Acad Sci USA</source><volume>107</volume>: <fpage>4687</fpage>–<lpage>4692</lpage>.<pub-id pub-id-type="pmid">20176961</pub-id></mixed-citation></ref><ref id="ref8"><label>8.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Russell</surname><given-names>CA</given-names></name><etal></etal></person-group>, <year>2012</year><article-title>The potential for respiratory droplet-transmissible A/H5N1 influenza virus to evolve in a mammalian host</article-title>. <source>Science</source><volume>336</volume>: <fpage>1541</fpage>–<lpage>1547</lpage>.<pub-id pub-id-type="pmid">22723414</pub-id></mixed-citation></ref><ref id="ref9"><label>9.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Rabinowitz</surname><given-names>P</given-names></name><name><surname>Perdue</surname><given-names>M</given-names></name><name><surname>Mumford</surname><given-names>E</given-names></name></person-group>, <year>2010</year><article-title>Contact variables for exposure to avian influenza H5N1 virus at the human-animal interface</article-title>. <source>Zoonoses Public Health</source><volume>57</volume>: <fpage>227</fpage>–<lpage>238</lpage>.<pub-id pub-id-type="pmid">19486500</pub-id></mixed-citation></ref><ref id="ref10"><label>10.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Van Kerkhove</surname><given-names>MD</given-names></name><name><surname>Mumford</surname><given-names>E</given-names></name><name><surname>Mounts</surname><given-names>AW</given-names></name><name><surname>Bresee</surname><given-names>J</given-names></name><name><surname>Ly</surname><given-names>S</given-names></name><name><surname>Bridges</surname><given-names>CB</given-names></name><name><surname>Otte</surname><given-names>J</given-names></name></person-group>, <year>2011</year><article-title>Highly pathogenic avian influenza (H5N1): pathways of exposure at the animal-human interface, a systematic review</article-title>. <source>PLoS One</source><volume>6</volume>: <fpage>e14582</fpage>.<pub-id pub-id-type="pmid">21283678</pub-id></mixed-citation></ref><ref id="ref11"><label>11.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Lai</surname><given-names>S</given-names></name><etal></etal></person-group>, <year>2016</year><article-title>Global epidemiology of avian influenza A H5N1 virus infection in humans, 1997–2015: a systematic review of individual case data</article-title>. <source>Lancet Infect Dis</source><volume>16</volume>: <fpage>e108</fpage>–<lpage>e118</lpage>.<pub-id pub-id-type="pmid">27211899</pub-id></mixed-citation></ref><ref id="ref12"><label>12.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Costard</surname><given-names>S</given-names></name><name><surname>Fournie</surname><given-names>G</given-names></name><name><surname>Pfeiffer</surname><given-names>DU</given-names></name></person-group>, <year>2014</year><article-title>Using risk assessment as part of a systems approach to the control and prevention of HPAIV H5N1</article-title>. <source>EcoHealth</source><volume>11</volume>: <fpage>36</fpage>–<lpage>43</lpage>.<pub-id pub-id-type="pmid">24488190</pub-id></mixed-citation></ref><ref id="ref13"><label>13.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Moher</surname><given-names>D</given-names></name><name><surname>Liberati</surname><given-names>A</given-names></name><name><surname>Tetzlaff</surname><given-names>J</given-names></name><name><surname>Altman</surname><given-names>DG</given-names></name><name><surname>Group</surname><given-names>P</given-names></name></person-group>, <year>2009</year><article-title>Preferred reporting items for systematic reviews and meta-analyses: the PRISMA statement</article-title>. <source>PLoS Med</source><volume>6</volume>: <fpage>e1000097</fpage>.<pub-id pub-id-type="pmid">19621072</pub-id></mixed-citation></ref><ref id="ref14"><label>14.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Claas</surname><given-names>EC</given-names></name><name><surname>Osterhaus</surname><given-names>AD</given-names></name><name><surname>van Beek</surname><given-names>R</given-names></name><name><surname>De Jong</surname><given-names>JC</given-names></name><name><surname>Rimmelzwaan</surname><given-names>GF</given-names></name><name><surname>Senne</surname><given-names>DA</given-names></name><name><surname>Krauss</surname><given-names>S</given-names></name><name><surname>Shortridge</surname><given-names>KF</given-names></name><name><surname>Webster</surname><given-names>RG</given-names></name></person-group>, <year>1998</year><article-title>Human influenza A H5N1 virus related to a highly pathogenic avian influenza virus</article-title>. <source>Lancet</source><volume>351</volume>: <fpage>472</fpage>–<lpage>477</lpage>.<pub-id pub-id-type="pmid">9482438</pub-id></mixed-citation></ref><ref id="ref15"><label>15.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Sterne</surname><given-names>JAC</given-names></name><name><surname>Higgins</surname><given-names>JPT</given-names></name><name><surname>Reeves</surname><given-names>BC</given-names></name></person-group>, <year>2014</year><source>A Cochrane Risk Of Bias Assessment Tool: for Non-Randomized Studies of Interventions (ACROBAT NRSI), Version 1.0.0</source>. <comment><italic>24 September 2014</italic></comment> Available at: <ext-link ext-link-type="uri" xlink:href="http://sites.google.com/site/riskofbiastool/">sites.google.com/site/riskofbiastool/</ext-link>. <comment>Accessed February 1, 2016</comment>.</mixed-citation></ref><ref id="ref16"><label>16.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Higgins</surname><given-names>JP</given-names></name><name><surname>Thompson</surname><given-names>SG</given-names></name><name><surname>Deeks</surname><given-names>JJ</given-names></name><name><surname>Altman</surname><given-names>DG</given-names></name></person-group>, <year>2003</year><article-title>Measuring inconsistency in meta-analyses</article-title>. <source>BMJ</source><volume>327</volume>: <fpage>557</fpage>–<lpage>560</lpage>.<pub-id pub-id-type="pmid">12958120</pub-id></mixed-citation></ref><ref id="ref17"><label>17.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>DerSimonian</surname><given-names>R</given-names></name><name><surname>Laird</surname><given-names>N</given-names></name></person-group>, <year>1986</year><article-title>Meta-analysis in clinical trials</article-title>. <source>Control Clin Trials</source><volume>7</volume>: <fpage>177</fpage>–<lpage>188</lpage>.<pub-id pub-id-type="pmid">3802833</pub-id></mixed-citation></ref><ref id="ref18"><label>18.</label><mixed-citation publication-type="book"><collab>R Development Core Team</collab>, <year>2015</year><source>R: A Language and Environment for Statistical Computing</source>. <publisher-loc>Vienna, Austria</publisher-loc>: <publisher-name>R Foundation for Statistical Computing</publisher-name>.</mixed-citation></ref><ref id="ref19"><label>19.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Viechtbauer</surname><given-names>W</given-names></name></person-group>, <year>2010</year><article-title>Conducting meta-analyses in R with the metafor package</article-title>. <source>J Stat Software</source><volume>36</volume>: <fpage>1</fpage>–<lpage>48</lpage>.</mixed-citation></ref><ref id="ref20"><label>20.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Mounts</surname><given-names>AW</given-names></name><etal></etal></person-group>, <year>1999</year><article-title>Case-control study of risk factors for avian influenza A (H5N1) disease, Hong Kong, 1997</article-title>. <source>J Infect Dis</source><volume>180</volume>: <fpage>505</fpage>–<lpage>508</lpage>.<pub-id pub-id-type="pmid">10395870</pub-id></mixed-citation></ref><ref id="ref21"><label>21.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Zhou</surname><given-names>L</given-names></name><etal></etal></person-group>, <year>2009</year><article-title>Risk factors for human illness with avian influenza A (H5N1) virus infection in China</article-title>. <source>J Infect Dis</source><volume>199</volume>: <fpage>1726</fpage>–<lpage>1734</lpage>.<pub-id pub-id-type="pmid">19416076</pub-id></mixed-citation></ref><ref id="ref22"><label>22.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Areechokchai</surname><given-names>D</given-names></name><name><surname>Jiraphongsa</surname><given-names>C</given-names></name><name><surname>Laosiritaworn</surname><given-names>Y</given-names></name><name><surname>Hanshaoworakul</surname><given-names>W</given-names></name></person-group>, O'Reilly M; Centers for Disease Control and Prevention, <year>2006</year> Investigation of avian influenza (H5N1) outbreak in humans–Thailand, 2004. <source>MMWR Morb Mortal Wkly Rep</source><volume>55</volume>: <fpage>3</fpage>–<lpage>6</lpage>.</mixed-citation></ref><ref id="ref23"><label>23.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Dinh</surname><given-names>PN</given-names></name><name><surname>Long</surname><given-names>HT</given-names></name><name><surname>Tien</surname><given-names>NT</given-names></name><name><surname>Hien</surname><given-names>NT</given-names></name><name><surname>Mai le</surname><given-names>TQ</given-names></name><name><surname>Phong le</surname><given-names>H</given-names></name><name><surname>Tuan le</surname><given-names>V</given-names></name><name><surname>Van Tan</surname><given-names>H</given-names></name><name><surname>Nguyen</surname><given-names>NB</given-names></name><name><surname>Van Tu</surname><given-names>P</given-names></name><name><surname>Phuong</surname><given-names>NT</given-names></name></person-group>, <year>2006</year><article-title>Risk factors for human infection with avian influenza A H5N1, Vietnam, 2004</article-title>. <source>Emerg Infect Dis</source><volume>12</volume>: <fpage>1841</fpage>–<lpage>1847</lpage>.<pub-id pub-id-type="pmid">17326934</pub-id></mixed-citation></ref><ref id="ref24"><label>24.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Yupiana</surname><given-names>Y</given-names></name><name><surname>de Vlas</surname><given-names>SJ</given-names></name><name><surname>Adnan</surname><given-names>NM</given-names></name><name><surname>Richardus</surname><given-names>JH</given-names></name></person-group>, <year>2010</year><article-title>Risk factors of poultry outbreaks and human cases of H5N1 avian influenza virus infection in West Java Province, Indonesia</article-title>. <source>Int J Infect Dis</source><volume>14</volume>: <fpage>e800</fpage>–<lpage>e805</lpage>.<pub-id pub-id-type="pmid">20637674</pub-id></mixed-citation></ref><ref id="ref25"><label>25.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Vong</surname><given-names>S</given-names></name><name><surname>Ly</surname><given-names>S</given-names></name><name><surname>Van Kerkhove</surname><given-names>MD</given-names></name><name><surname>Achenbach</surname><given-names>J</given-names></name><name><surname>Holl</surname><given-names>D</given-names></name><name><surname>Buchy</surname><given-names>P</given-names></name><name><surname>Sorn</surname><given-names>S</given-names></name><name><surname>Seng</surname><given-names>H</given-names></name><name><surname>Uyeki</surname><given-names>TM</given-names></name><name><surname>Sok</surname><given-names>T</given-names></name><name><surname>Katz</surname><given-names>JM</given-names></name></person-group>, <year>2009</year> Risk factors associated with subclinical human infection with avian influenza A (H5N1) virus–Cambodia, 2006. <source>J Infect Dis</source><volume>199</volume>: <fpage>1744</fpage>–<lpage>1752</lpage>.<pub-id pub-id-type="pmid">19416078</pub-id></mixed-citation></ref><ref id="ref26"><label>26.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Bridges</surname><given-names>CB</given-names></name><etal></etal></person-group>, <year>2002</year><article-title>Risk of influenza A (H5N1) infection among poultry workers, Hong Kong, 1997–1998</article-title>. <source>J Infect Dis</source><volume>185</volume>: <fpage>1005</fpage>–<lpage>1010</lpage>.<pub-id pub-id-type="pmid">11930308</pub-id></mixed-citation></ref><ref id="ref27"><label>27.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Cavailler</surname><given-names>P</given-names></name><name><surname>Chu</surname><given-names>S</given-names></name><name><surname>Ly</surname><given-names>S</given-names></name><name><surname>Garcia</surname><given-names>JM</given-names></name><name><surname>Ha do</surname><given-names>Q</given-names></name><name><surname>Bergeri</surname><given-names>I</given-names></name><name><surname>Som</surname><given-names>L</given-names></name><name><surname>Sok</surname><given-names>T</given-names></name><name><surname>Vong</surname><given-names>S</given-names></name><name><surname>Buchy</surname><given-names>P</given-names></name></person-group>, <year>2010</year><article-title>Seroprevalence of anti-H5 antibody in rural Cambodia, 2007</article-title>. <source>J Clin Virol</source><volume>48</volume>: <fpage>123</fpage>–<lpage>126</lpage>.<pub-id pub-id-type="pmid">20356781</pub-id></mixed-citation></ref><ref id="ref28"><label>28.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Huo</surname><given-names>X</given-names></name><name><surname>Zu</surname><given-names>RQ</given-names></name><name><surname>Qi</surname><given-names>X</given-names></name><name><surname>Qin</surname><given-names>YF</given-names></name><name><surname>Li</surname><given-names>L</given-names></name><name><surname>Tang</surname><given-names>FY</given-names></name><name><surname>Hu</surname><given-names>ZB</given-names></name><name><surname>Zhu</surname><given-names>FC</given-names></name></person-group>, <year>2012</year><article-title>Seroprevalence of avian influenza A (H5N1) virus among poultry workers in Jiangsu Province, China: an observational study</article-title>. <source>BMC Infect Dis</source><volume>12</volume>: <fpage>93</fpage>.<pub-id pub-id-type="pmid">22512873</pub-id></mixed-citation></ref><ref id="ref29"><label>29.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Li</surname><given-names>LH</given-names></name><name><surname>Yu</surname><given-names>Z</given-names></name><name><surname>Chen</surname><given-names>WS</given-names></name><name><surname>Liu</surname><given-names>SL</given-names></name><name><surname>Lu</surname><given-names>Y</given-names></name><name><surname>Zhang</surname><given-names>YJ</given-names></name><name><surname>Chen</surname><given-names>EF</given-names></name><name><surname>Lin</surname><given-names>JF</given-names></name></person-group>, <year>2013</year><article-title>Evidence for H5 avian influenza infection in Zhejiang province, China, 2010–2012: a cross-sectional study</article-title>. <source>J Thorac Dis</source><volume>5</volume>: <fpage>790</fpage>–<lpage>796</lpage>.<pub-id pub-id-type="pmid">24409357</pub-id></mixed-citation></ref><ref id="ref30"><label>30.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Gomaa</surname><given-names>MR</given-names></name><etal></etal></person-group>, <year>2015</year><article-title>Avian influenza A(H5N1) and A(H9N2) seroprevalence and risk factors for infection among Egyptians: a prospective, controlled seroepidemiological study</article-title>. <source>J Infect Dis</source><volume>211</volume>: <fpage>1399</fpage>–<lpage>1407</lpage>.<pub-id pub-id-type="pmid">25355942</pub-id></mixed-citation></ref><ref id="ref31"><label>31.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Li</surname><given-names>J</given-names></name><name><surname>Chen</surname><given-names>J</given-names></name><name><surname>Yang</surname><given-names>G</given-names></name><name><surname>Zheng</surname><given-names>YX</given-names></name><name><surname>Mao</surname><given-names>SH</given-names></name><name><surname>Zhu</surname><given-names>WP</given-names></name><name><surname>Yu</surname><given-names>XL</given-names></name><name><surname>Gao</surname><given-names>Y</given-names></name><name><surname>Pan</surname><given-names>QC</given-names></name><name><surname>Yuan</surname><given-names>ZA</given-names></name></person-group>, <year>2015</year><article-title>Case-control study of risk factors for human infection with avian influenza A (H7N9) virus in Shanghai, China, 2013</article-title>. <source>Epidemiol Infect</source><volume>143</volume>: <fpage>1826</fpage>–<lpage>1832</lpage>.<pub-id pub-id-type="pmid">25471822</pub-id></mixed-citation></ref><ref id="ref32"><label>32.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Liu</surname><given-names>B</given-names></name><etal></etal></person-group>, <year>2014</year><article-title>Risk Factors for Influenza A(H7N9) Disease-China, 2013</article-title>. <source>Clin Infect Dis</source><volume>59</volume>: <fpage>787</fpage>–<lpage>794</lpage>.<pub-id pub-id-type="pmid">24928293</pub-id></mixed-citation></ref><ref id="ref33"><label>33.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>He</surname><given-names>F</given-names></name><name><surname>Zhang</surname><given-names>M</given-names></name><name><surname>Wang</surname><given-names>XY</given-names></name><name><surname>Wu</surname><given-names>HC</given-names></name><name><surname>Shang</surname><given-names>XP</given-names></name><name><surname>Li</surname><given-names>FD</given-names></name><name><surname>Wu</surname><given-names>C</given-names></name><name><surname>Lin</surname><given-names>JF</given-names></name><name><surname>Zhu</surname><given-names>BP</given-names></name></person-group>, <year>2014</year><article-title>Distinct risk profiles for human infections with the influenza A(H7N9) virus among rural and urban residents: Zhejiang Province, China, 2013</article-title>. <source>PLoS One</source><volume>9</volume>: <fpage>e95015</fpage>.<pub-id pub-id-type="pmid">24789082</pub-id></mixed-citation></ref><ref id="ref34"><label>34.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Ai</surname><given-names>J</given-names></name><etal></etal></person-group>, <year>2013</year><article-title>Case-control study of risk factors for human infection with influenza A(H7N9) virus in Jiangsu Province, China, 2013</article-title>. <source>Euro Surveillance: Bulletin Europeen sur les Maladies Transmissibles</source><volume>18</volume>: <fpage>20510</fpage>.</mixed-citation></ref><ref id="ref35"><label>35.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Yu</surname><given-names>H</given-names></name><etal></etal></person-group>, <year>2014</year><article-title>Effect of closure of live poultry markets on poultry-to-person transmission of avian influenza A H7N9 virus: an ecological study</article-title>. <source>Lancet</source><volume>383</volume>: <fpage>541</fpage>–<lpage>548</lpage>.<pub-id pub-id-type="pmid">24183056</pub-id></mixed-citation></ref><ref id="ref36"><label>36.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Fang</surname><given-names>LQ</given-names></name><name><surname>Li</surname><given-names>XL</given-names></name><name><surname>Liu</surname><given-names>K</given-names></name><name><surname>Li</surname><given-names>YJ</given-names></name><name><surname>Yao</surname><given-names>HW</given-names></name><name><surname>Liang</surname><given-names>S</given-names></name><name><surname>Yang</surname><given-names>Y</given-names></name><name><surname>Feng</surname><given-names>ZJ</given-names></name><name><surname>Gray</surname><given-names>GC</given-names></name><name><surname>Cao</surname><given-names>WC</given-names></name></person-group>, <year>2013</year><article-title>Mapping spread and risk of avian influenza A (H7N9) in China</article-title>. <source>Sci Rep</source><volume>3</volume>: <fpage>2722</fpage>.<pub-id pub-id-type="pmid">24072008</pub-id></mixed-citation></ref><ref id="ref37"><label>37.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Fuller</surname><given-names>T</given-names></name><name><surname>Havers</surname><given-names>F</given-names></name><name><surname>Xu</surname><given-names>C</given-names></name><name><surname>Fang</surname><given-names>LQ</given-names></name><name><surname>Cao</surname><given-names>WC</given-names></name><name><surname>Shu</surname><given-names>Y</given-names></name><name><surname>Widdowson</surname><given-names>MA</given-names></name><name><surname>Smith</surname><given-names>TB</given-names></name></person-group>, <year>2014</year><article-title>Identifying areas with a high risk of human infection with the avian influenza A (H7N9) virus in east Asia</article-title>. <source>J Infect</source><volume>69</volume>: <fpage>174</fpage>–<lpage>181</lpage>.<pub-id pub-id-type="pmid">24642206</pub-id></mixed-citation></ref><ref id="ref38"><label>38.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Wu</surname><given-names>P</given-names></name><etal></etal></person-group>, <year>2014</year><article-title>Poultry market closures and human infection with influenza A(H7N9) virus, China, 2013–14</article-title>. <source>Emerg Infect Dis</source><volume>20</volume>: <fpage>1891</fpage>–<lpage>1894</lpage>.<pub-id pub-id-type="pmid">25340354</pub-id></mixed-citation></ref><ref id="ref39"><label>39.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Wang</surname><given-names>X</given-names></name><etal></etal></person-group>, <year>2014</year><article-title>Seroprevalence to avian influenza A(H7N9) virus among poultry workers and the general population in southern China: a longitudinal study</article-title>. <source>Clin Infect Dis</source><volume>59</volume>: <fpage>e76</fpage>–<lpage>e83</lpage>.<pub-id pub-id-type="pmid">24867786</pub-id></mixed-citation></ref><ref id="ref40"><label>40.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Ahad</surname><given-names>A</given-names></name><etal></etal></person-group>, <year>2014</year><article-title>Risk factors for H7 and H9 infection in commercial poultry farm workers in provinces within Pakistan</article-title>. <source>Prev Vet Med</source><volume>117</volume>: <fpage>610</fpage>–<lpage>614</lpage>.<pub-id pub-id-type="pmid">25457514</pub-id></mixed-citation></ref><ref id="ref41"><label>41.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Yang</surname><given-names>P</given-names></name><etal></etal></person-group>, <year>2012</year><article-title>A serological survey of antibodies to H5, H7 and H9 avian influenza viruses amongst the duck-related workers in Beijing, China</article-title>. <source>PLoS One</source><volume>7</volume>: <fpage>e50770</fpage>.<pub-id pub-id-type="pmid">23226380</pub-id></mixed-citation></ref><ref id="ref42"><label>42.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Yu</surname><given-names>Q</given-names></name><etal></etal></person-group>, <year>2013</year><article-title>Risk perceptions for avian influenza virus infection among poultry workers, China</article-title>. <source>Emerg Infect Dis</source><volume>19</volume>: <fpage>313</fpage>–<lpage>316</lpage>.<pub-id pub-id-type="pmid">23343592</pub-id></mixed-citation></ref><ref id="ref43"><label>43.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Sultana</surname><given-names>R</given-names></name><name><surname>Nahar</surname><given-names>N</given-names></name><name><surname>Rimi</surname><given-names>NA</given-names></name><name><surname>Azad</surname><given-names>S</given-names></name><name><surname>Islam</surname><given-names>MS</given-names></name><name><surname>Gurley</surname><given-names>ES</given-names></name><name><surname>Luby</surname><given-names>SP</given-names></name></person-group>, <year>2012</year><article-title>Backyard poultry raising in Bangladesh: a valued resource for the villagers and a setting for zoonotic transmission of avian influenza. A qualitative study</article-title>. <source>Rural Remote Health</source><volume>12</volume>: <fpage>1927</fpage>.<pub-id pub-id-type="pmid">22950607</pub-id></mixed-citation></ref><ref id="ref44"><label>44.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Sultana</surname><given-names>R</given-names></name><name><surname>Rimi</surname><given-names>NA</given-names></name><name><surname>Azad</surname><given-names>S</given-names></name><name><surname>Islam</surname><given-names>MS</given-names></name><name><surname>Khan</surname><given-names>MSU</given-names></name><name><surname>Gurley</surname><given-names>ES</given-names></name><name><surname>Nahar</surname><given-names>N</given-names></name><name><surname>Luby</surname><given-names>SP</given-names></name></person-group>, <year>2012</year><article-title>Bangladeshi backyard poultry raisers' perceptions and practices related to zoonotic transmission of avian influenza</article-title>. <source>J Infect Dev Ctries</source><volume>6</volume>: <fpage>156</fpage>–<lpage>165</lpage>.<pub-id pub-id-type="pmid">22337845</pub-id></mixed-citation></ref><ref id="ref45"><label>45.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Edirne</surname><given-names>T</given-names></name><name><surname>Avci</surname><given-names>DK</given-names></name><name><surname>Dagkara</surname><given-names>B</given-names></name><name><surname>Aslan</surname><given-names>M</given-names></name></person-group>, <year>2011</year><article-title>Knowledge and anticipated attitudes of the community about bird flu outbreak in Turkey, 2007–2008: a survey-based descriptive study</article-title>. <source>Int J Public Health</source><volume>56</volume>: <fpage>163</fpage>–<lpage>168</lpage>.<pub-id pub-id-type="pmid">20217176</pub-id></mixed-citation></ref><ref id="ref46"><label>46.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Ma</surname><given-names>X</given-names></name><etal></etal></person-group>, <year>2014</year><article-title>Knowledge, attitudes and practices relating to influenza A(H7N9) risk among live poultry traders in Guangzhou City, China</article-title>. <source>BMC Infect Dis</source><volume>14</volume>: <fpage>554</fpage>.<pub-id pub-id-type="pmid">25324011</pub-id></mixed-citation></ref><ref id="ref47"><label>47.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Liao</surname><given-names>QY</given-names></name><name><surname>Lam</surname><given-names>WWT</given-names></name><name><surname>Bich</surname><given-names>TH</given-names></name><name><surname>Dang</surname><given-names>VT</given-names></name><name><surname>Fielding</surname><given-names>R</given-names></name></person-group>, <year>2014</year><article-title>Comparison of behaviors regarding live poultry exposure among rural residents in Vietnam and Thailand</article-title>. <source>J Infect Dev Ctries</source><volume>8</volume>: <fpage>526</fpage>–<lpage>534</lpage>.<pub-id pub-id-type="pmid">24727520</pub-id></mixed-citation></ref><ref id="ref48"><label>48.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Rimi</surname><given-names>NA</given-names></name><name><surname>Sultana</surname><given-names>R</given-names></name><name><surname>Ishtiak-Ahmed</surname><given-names>K</given-names></name><name><surname>Khan</surname><given-names>SU</given-names></name><name><surname>Sharker</surname><given-names>MAY</given-names></name><name><surname>Uz Zaman</surname><given-names>R</given-names></name><name><surname>Azziz-Baumgartner</surname><given-names>E</given-names></name><name><surname>Gurley</surname><given-names>ES</given-names></name><name><surname>Nahar</surname><given-names>N</given-names></name><name><surname>Luby</surname><given-names>SP</given-names></name></person-group>, <year>2014</year><article-title>Poultry slaughtering practices in rural communities of Bangladesh and risk of avian influenza transmission: a qualitative study</article-title>. <source>EcoHealth</source><volume>11</volume>: <fpage>83</fpage>–<lpage>93</lpage>.<pub-id pub-id-type="pmid">24306550</pub-id></mixed-citation></ref><ref id="ref49"><label>49.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Negro-Calduch</surname><given-names>E</given-names></name><name><surname>Elfadaly</surname><given-names>S</given-names></name><name><surname>Tibbo</surname><given-names>M</given-names></name><name><surname>Ankers</surname><given-names>P</given-names></name><name><surname>Bailey</surname><given-names>E</given-names></name></person-group>, <year>2013</year><article-title>Assessment of biosecurity practices of small-scale broiler producers in central Egypt</article-title>. <source>Prev Vet Med</source><volume>110</volume>: <fpage>253</fpage>–<lpage>262</lpage>.<pub-id pub-id-type="pmid">23218658</pub-id></mixed-citation></ref><ref id="ref50"><label>50.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Barennes</surname><given-names>H</given-names></name><name><surname>Harimanana</surname><given-names>AN</given-names></name><name><surname>Lorvongseng</surname><given-names>S</given-names></name><name><surname>Ongkhammy</surname><given-names>S</given-names></name><name><surname>Chu</surname><given-names>C</given-names></name></person-group>, <year>2010</year><article-title>Paradoxical risk perception and behaviours related to Avian Flu outbreak and education campaign, Laos</article-title>. <source>BMC Infect Dis</source><volume>10</volume>: <fpage>294</fpage>.<pub-id pub-id-type="pmid">20937155</pub-id></mixed-citation></ref><ref id="ref51"><label>51.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Barennes</surname><given-names>H</given-names></name><name><surname>Martinez-Aussel</surname><given-names>B</given-names></name><name><surname>Vongphrachanh</surname><given-names>P</given-names></name><name><surname>Strobe</surname><given-names>M</given-names></name></person-group>, <year>2007</year><article-title>Avian influenza risk perceptions, Laos</article-title>. <source>Emerg Infect Dis</source><volume>13</volume>: <fpage>1126</fpage>–<lpage>1128</lpage>.<pub-id pub-id-type="pmid">18214204</pub-id></mixed-citation></ref><ref id="ref52"><label>52.</label><mixed-citation publication-type="book"><person-group person-group-type="author"><name><surname>Sutanto</surname><given-names>YC</given-names></name></person-group>, <year>2013</year><source>Highly Pathogenic Avian Influenza Knowledge, Attitudes, and Practices Study among Live Bird Market Workers in Jakarta—Indonesia</source>. <publisher-loc>Fort Collins, CO</publisher-loc>: <publisher-name>Department of Clinical Sciences, Colorado State University</publisher-name>, <volume>153</volume>.</mixed-citation></ref><ref id="ref53"><label>53.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Shortridge</surname><given-names>KF</given-names></name><etal></etal></person-group>, <year>1998</year><article-title>Characterization of avian H5N1 influenza viruses from poultry in Hong Kong</article-title>. <source>Virology</source><volume>252</volume>: <fpage>331</fpage>–<lpage>342</lpage>.<pub-id pub-id-type="pmid">9878612</pub-id></mixed-citation></ref><ref id="ref54"><label>54.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Fournié</surname><given-names>G</given-names></name><name><surname>Guitian</surname><given-names>J</given-names></name><name><surname>Mangtani</surname><given-names>P</given-names></name><name><surname>Ghani</surname><given-names>AC</given-names></name></person-group>, <year>2011</year><article-title>Impact of the implementation of rest days in live bird markets on the dynamics of H5N1 highly pathogenic avian influenza</article-title>. <source>J R Soc Interface</source><volume>8</volume>: <fpage>1079</fpage>–<lpage>1089</lpage>.<pub-id pub-id-type="pmid">21131332</pub-id></mixed-citation></ref><ref id="ref55"><label>55.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Tellier</surname><given-names>R</given-names></name></person-group>, <year>2006</year><article-title>Review of aerosol transmission of influenza A virus</article-title>. <source>Emerg Infect Dis</source><volume>12</volume>: <fpage>1657</fpage>–<lpage>1662</lpage>.<pub-id pub-id-type="pmid">17283614</pub-id></mixed-citation></ref><ref id="ref56"><label>56.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Webster</surname><given-names>RG</given-names></name><etal></etal></person-group>, <year>2002</year><article-title>Characterization of H5N1 influenza viruses that continue to circulate in geese in southeastern China</article-title>. <source>J Virol</source><volume>76</volume>: <fpage>118</fpage>–<lpage>126</lpage>.<pub-id pub-id-type="pmid">11739677</pub-id></mixed-citation></ref><ref id="ref57"><label>57.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Allen</surname><given-names>VM</given-names></name><name><surname>Hinton</surname><given-names>MH</given-names></name><name><surname>Tinker</surname><given-names>DB</given-names></name><name><surname>Gibson</surname><given-names>C</given-names></name><name><surname>Mead</surname><given-names>GC</given-names></name><name><surname>Wathes</surname><given-names>CM</given-names></name></person-group>, <year>2003</year><article-title>Microbial cross-contamination by airborne dispersion and contagion during defeathering of poultry</article-title>. <source>Br Poult Sci</source><volume>44</volume>: <fpage>567</fpage>–<lpage>576</lpage>.<pub-id pub-id-type="pmid">14584847</pub-id></mixed-citation></ref><ref id="ref58"><label>58.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Offeddu</surname><given-names>V</given-names></name><name><surname>Cowling</surname><given-names>BJ</given-names></name><name><surname>Malik Peiris</surname><given-names>JS</given-names></name></person-group>, <year>2016</year><article-title>Interventions in live poultry markets for the control of avian influenza: a systematic review</article-title>. <source>One Health</source><volume>2</volume>: <fpage>55</fpage>–<lpage>64</lpage>.<pub-id pub-id-type="pmid">27213177</pub-id></mixed-citation></ref><ref id="ref59"><label>59.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Hill</surname><given-names>AB</given-names></name></person-group>, <year>1965</year><article-title>The environment and disease: association or causation?</article-title><source>Proc R Soc Med</source><volume>58</volume>: <fpage>295</fpage>–<lpage>300</lpage>.<pub-id pub-id-type="pmid">14283879</pub-id></mixed-citation></ref><ref id="ref60"><label>60.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Lucas</surname><given-names>RM</given-names></name><name><surname>McMichael</surname><given-names>AJ</given-names></name></person-group>, <year>2005</year><article-title>Association or causation: evaluating links between “environment and disease”</article-title>. <source>Bull World Health Organ</source><volume>83</volume>: <fpage>792</fpage>–<lpage>795</lpage>.<pub-id pub-id-type="pmid">16283057</pub-id></mixed-citation></ref><ref id="ref61"><label>61.</label><mixed-citation publication-type="book"><person-group person-group-type="author"><name><surname>Aunger</surname><given-names>R</given-names></name><name><surname>Curtis</surname><given-names>V</given-names></name></person-group>, <year>2015</year><source>Gaining Control: How Human Behavior Evolved</source>. <comment>Oxford, United Kingdom</comment>: <publisher-name>Oxford University Press</publisher-name>.</mixed-citation></ref><ref id="ref62"><label>62.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Barnett</surname><given-names>T</given-names></name><name><surname>Fournie</surname><given-names>G</given-names></name><name><surname>Gupta</surname><given-names>S</given-names></name><name><surname>Seeley</surname><given-names>J</given-names></name></person-group>, <year>2015</year><article-title>Some considerations concerning the challenge of incorporating social variables into epidemiological models of infectious disease transmission</article-title>. <source>Glob Public Health</source><volume>10</volume>: <fpage>438</fpage>–<lpage>448</lpage>.<pub-id pub-id-type="pmid">25648796</pub-id></mixed-citation></ref><ref id="ref63"><label>63.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Barnett</surname><given-names>T</given-names></name><name><surname>Seeley</surname><given-names>J</given-names></name><name><surname>Levin</surname><given-names>J</given-names></name><name><surname>Katongole</surname><given-names>J</given-names></name></person-group>, <year>2015</year><article-title>Hope: a new approach to understanding structural factors in HIV acquisition</article-title>. <source>Glob Public Health</source><volume>10</volume>: <fpage>417</fpage>–<lpage>437</lpage>.<pub-id pub-id-type="pmid">25648679</pub-id></mixed-citation></ref><ref id="ref64"><label>64.</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Biran</surname><given-names>A</given-names></name><name><surname>Schmidt</surname><given-names>WP</given-names></name><name><surname>Varadharajan</surname><given-names>KS</given-names></name><name><surname>Rajaraman</surname><given-names>D</given-names></name><name><surname>Kumar</surname><given-names>R</given-names></name><name><surname>Greenland</surname><given-names>K</given-names></name><name><surname>Gopalan</surname><given-names>B</given-names></name><name><surname>Aunger</surname><given-names>R</given-names></name><name><surname>Curtis</surname><given-names>V</given-names></name></person-group>, <year>2014</year><article-title>Effect of a behaviour-change intervention on handwashing with soap in India (SuperAmma): a cluster-randomised trial</article-title>. <source>Lancet Glob Health</source><volume>2</volume>: <fpage>e145</fpage>–<lpage>e154</lpage>.<pub-id 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