Transmission dynamics and risk factors for pandemic H1N1-related illness: outbreak investigation in a rural community of British Columbia, Canada.
Identifieur interne : 000394 ( Main/Exploration ); précédent : 000393; suivant : 000395Transmission dynamics and risk factors for pandemic H1N1-related illness: outbreak investigation in a rural community of British Columbia, Canada.
Auteurs : Naveed Z. Janjua [Canada] ; Danuta M. Skowronski ; Travis S. Hottes ; William Osei ; Evan Adams ; Martin Petric ; Marcus Lem ; Patrick Tang ; Gaston De Serres ; David M. Patrick ; David BoweringSource :
- Influenza and other respiratory viruses [ 1750-2659 ] ; 2012.
Descripteurs français
- KwdFr :
- Adolescent, Adulte, Adulte d'âge moyen, Caractéristiques familiales, Colombie-Britannique (épidémiologie), Enfant, Enfant d'âge préscolaire, Facteurs de risque, Femelle, Flambées de maladies, Grippe humaine (transmission), Grippe humaine (virologie), Grippe humaine (épidémiologie), Humains, Incidence, Jeune adulte, Mâle, Nourrisson, Pandémies, Population rurale, Sous-type H1N1 du virus de la grippe A (génétique), Sous-type H1N1 du virus de la grippe A (isolement et purification), Sujet âgé, Établissements scolaires.
- MESH :
- génétique : Sous-type H1N1 du virus de la grippe A.
- isolement et purification : Sous-type H1N1 du virus de la grippe A.
- virologie : Grippe humaine.
- épidémiologie : Colombie-Britannique, Grippe humaine.
- Adolescent, Adulte, Adulte d'âge moyen, Caractéristiques familiales, Enfant, Enfant d'âge préscolaire, Facteurs de risque, Femelle, Flambées de maladies, Humains, Incidence, Jeune adulte, Mâle, Nourrisson, Pandémies, Population rurale, Sujet âgé, Établissements scolaires.
English descriptors
- KwdEn :
- Adolescent, Adult, Aged, British Columbia (epidemiology), Child, Child, Preschool, Disease Outbreaks, Family Characteristics, Female, Humans, Incidence, Infant, Influenza A Virus, H1N1 Subtype (genetics), Influenza A Virus, H1N1 Subtype (isolation & purification), Influenza, Human (epidemiology), Influenza, Human (transmission), Influenza, Human (virology), Male, Middle Aged, Pandemics, Risk Factors, Rural Population, Schools, Young Adult.
- MESH :
- geographic , epidemiology : British Columbia.
- epidemiology : Influenza, Human.
- genetics : Influenza A Virus, H1N1 Subtype.
- isolation & purification : Influenza A Virus, H1N1 Subtype.
- transmission : Influenza, Human.
- virology : Influenza, Human.
- Adolescent, Adult, Aged, Child, Child, Preschool, Disease Outbreaks, Family Characteristics, Female, Humans, Incidence, Infant, Male, Middle Aged, Pandemics, Risk Factors, Rural Population, Schools, Young Adult.
Abstract
OBJECTIVE
To characterize the first-wave epidemiologic features of influenza-like illness (ILI) associated with the novel pandemic A/H1N1 [A(H1N1)pdm09] virus.
METHODS
We used generalized linear mixed models (GLMM) to assess risk factors and non-parametric and/or parametric distributions to estimate attack rates, secondary attack rates (SAR), duration of illness, and serial interval during a laboratory-confirmed community outbreak of A(H1N1)pdm09 clustered around on-reserve residents and households of an elementary school in rural British Columbia, Canada, in late April/early May 2009. ILI details were collected as part of outbreak investigation by community telephone survey in early June 2009.
RESULTS
Overall, 92/408 (23%) of participants developed ILI and 36/408 (9%) experienced medically attended ILI (MAILI). The overall SAR in households was 22%: highest among participants 1-4 years of age (yoa) (50%) followed by < 1 yoa (38%), 5-8 yoa (20%), 10-19 yoa (13%), 20-49 yoa (20%), and 50-64 yoa (0%). The median serial interval was estimated at 3·5 days (95% CI: 2·1-5·1). In multivariable GLMM analysis, having a chronic condition (OR: 2·58; 95% CI: 1·1-6·04), younger age [1-8 yoa: OR: 4·63; 95% CI: 2·25-9·52; 9-19 yoa: OR: 1·95; 95% CI: 0·97-3·9 (referent: ≥ 20 yoa)] and receipt of 2008-2009 influenza vaccine (OR: 2·68; 95% CI: 1·37-5·25) were associated with increased risk of ILI. Median duration of illness was 9 days, longer among those with chronic conditions (21 days). Median time to seeking care after developing illness was 4·5 days. On-reserve participants had higher chronic conditions, household density, ILI, MAILI, and SAR.
CONCLUSIONS
During a community outbreak of A(H1N1)pdm09-related illness, we identified substantial clinical ILI attack rates exceeding 20% with secondary household attack rates as high as 50% in young children. The serial interval was short suggesting a narrow period to prevent transmission.
DOI: 10.1111/j.1750-2659.2012.00344.x
PubMed: 22385647
Affiliations:
Links toward previous steps (curation, corpus...)
Le document en format XML
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<front><div type="abstract" xml:lang="en"><p><b>OBJECTIVE</b>
</p>
<p>To characterize the first-wave epidemiologic features of influenza-like illness (ILI) associated with the novel pandemic A/H1N1 [A(H1N1)pdm09] virus.</p>
</div>
<div type="abstract" xml:lang="en"><p><b>METHODS</b>
</p>
<p>We used generalized linear mixed models (GLMM) to assess risk factors and non-parametric and/or parametric distributions to estimate attack rates, secondary attack rates (SAR), duration of illness, and serial interval during a laboratory-confirmed community outbreak of A(H1N1)pdm09 clustered around on-reserve residents and households of an elementary school in rural British Columbia, Canada, in late April/early May 2009. ILI details were collected as part of outbreak investigation by community telephone survey in early June 2009.</p>
</div>
<div type="abstract" xml:lang="en"><p><b>RESULTS</b>
</p>
<p>Overall, 92/408 (23%) of participants developed ILI and 36/408 (9%) experienced medically attended ILI (MAILI). The overall SAR in households was 22%: highest among participants 1-4 years of age (yoa) (50%) followed by < 1 yoa (38%), 5-8 yoa (20%), 10-19 yoa (13%), 20-49 yoa (20%), and 50-64 yoa (0%). The median serial interval was estimated at 3·5 days (95% CI: 2·1-5·1). In multivariable GLMM analysis, having a chronic condition (OR: 2·58; 95% CI: 1·1-6·04), younger age [1-8 yoa: OR: 4·63; 95% CI: 2·25-9·52; 9-19 yoa: OR: 1·95; 95% CI: 0·97-3·9 (referent: ≥ 20 yoa)] and receipt of 2008-2009 influenza vaccine (OR: 2·68; 95% CI: 1·37-5·25) were associated with increased risk of ILI. Median duration of illness was 9 days, longer among those with chronic conditions (21 days). Median time to seeking care after developing illness was 4·5 days. On-reserve participants had higher chronic conditions, household density, ILI, MAILI, and SAR.</p>
</div>
<div type="abstract" xml:lang="en"><p><b>CONCLUSIONS</b>
</p>
<p>During a community outbreak of A(H1N1)pdm09-related illness, we identified substantial clinical ILI attack rates exceeding 20% with secondary household attack rates as high as 50% in young children. The serial interval was short suggesting a narrow period to prevent transmission.</p>
</div>
</front>
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<DateCompleted><Year>2012</Year>
<Month>07</Month>
<Day>30</Day>
</DateCompleted>
<DateRevised><Year>2018</Year>
<Month>11</Month>
<Day>13</Day>
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<Issue>3</Issue>
<PubDate><Year>2012</Year>
<Month>May</Month>
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<Title>Influenza and other respiratory viruses</Title>
<ISOAbbreviation>Influenza Other Respir Viruses</ISOAbbreviation>
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<ArticleTitle>Transmission dynamics and risk factors for pandemic H1N1-related illness: outbreak investigation in a rural community of British Columbia, Canada.</ArticleTitle>
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<ELocationID EIdType="doi" ValidYN="Y">10.1111/j.1750-2659.2012.00344.x</ELocationID>
<Abstract><AbstractText Label="OBJECTIVE" NlmCategory="OBJECTIVE">To characterize the first-wave epidemiologic features of influenza-like illness (ILI) associated with the novel pandemic A/H1N1 [A(H1N1)pdm09] virus.</AbstractText>
<AbstractText Label="METHODS" NlmCategory="METHODS">We used generalized linear mixed models (GLMM) to assess risk factors and non-parametric and/or parametric distributions to estimate attack rates, secondary attack rates (SAR), duration of illness, and serial interval during a laboratory-confirmed community outbreak of A(H1N1)pdm09 clustered around on-reserve residents and households of an elementary school in rural British Columbia, Canada, in late April/early May 2009. ILI details were collected as part of outbreak investigation by community telephone survey in early June 2009.</AbstractText>
<AbstractText Label="RESULTS" NlmCategory="RESULTS">Overall, 92/408 (23%) of participants developed ILI and 36/408 (9%) experienced medically attended ILI (MAILI). The overall SAR in households was 22%: highest among participants 1-4 years of age (yoa) (50%) followed by < 1 yoa (38%), 5-8 yoa (20%), 10-19 yoa (13%), 20-49 yoa (20%), and 50-64 yoa (0%). The median serial interval was estimated at 3·5 days (95% CI: 2·1-5·1). In multivariable GLMM analysis, having a chronic condition (OR: 2·58; 95% CI: 1·1-6·04), younger age [1-8 yoa: OR: 4·63; 95% CI: 2·25-9·52; 9-19 yoa: OR: 1·95; 95% CI: 0·97-3·9 (referent: ≥ 20 yoa)] and receipt of 2008-2009 influenza vaccine (OR: 2·68; 95% CI: 1·37-5·25) were associated with increased risk of ILI. Median duration of illness was 9 days, longer among those with chronic conditions (21 days). Median time to seeking care after developing illness was 4·5 days. On-reserve participants had higher chronic conditions, household density, ILI, MAILI, and SAR.</AbstractText>
<AbstractText Label="CONCLUSIONS" NlmCategory="CONCLUSIONS">During a community outbreak of A(H1N1)pdm09-related illness, we identified substantial clinical ILI attack rates exceeding 20% with secondary household attack rates as high as 50% in young children. The serial interval was short suggesting a narrow period to prevent transmission.</AbstractText>
<CopyrightInformation>© 2012 Blackwell Publishing Ltd.</CopyrightInformation>
</Abstract>
<AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Janjua</LastName>
<ForeName>Naveed Z</ForeName>
<Initials>NZ</Initials>
<AffiliationInfo><Affiliation>BC Centre for Disease Control, Vancouver, BC, Canada. naveed.janjua@bccdc.ca</Affiliation>
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<Author ValidYN="Y"><LastName>Skowronski</LastName>
<ForeName>Danuta M</ForeName>
<Initials>DM</Initials>
</Author>
<Author ValidYN="Y"><LastName>Hottes</LastName>
<ForeName>Travis S</ForeName>
<Initials>TS</Initials>
</Author>
<Author ValidYN="Y"><LastName>Osei</LastName>
<ForeName>William</ForeName>
<Initials>W</Initials>
</Author>
<Author ValidYN="Y"><LastName>Adams</LastName>
<ForeName>Evan</ForeName>
<Initials>E</Initials>
</Author>
<Author ValidYN="Y"><LastName>Petric</LastName>
<ForeName>Martin</ForeName>
<Initials>M</Initials>
</Author>
<Author ValidYN="Y"><LastName>Lem</LastName>
<ForeName>Marcus</ForeName>
<Initials>M</Initials>
</Author>
<Author ValidYN="Y"><LastName>Tang</LastName>
<ForeName>Patrick</ForeName>
<Initials>P</Initials>
</Author>
<Author ValidYN="Y"><LastName>De Serres</LastName>
<ForeName>Gaston</ForeName>
<Initials>G</Initials>
</Author>
<Author ValidYN="Y"><LastName>Patrick</LastName>
<ForeName>David M</ForeName>
<Initials>DM</Initials>
</Author>
<Author ValidYN="Y"><LastName>Bowering</LastName>
<ForeName>David</ForeName>
<Initials>D</Initials>
</Author>
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<Language>eng</Language>
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<ArticleDate DateType="Electronic"><Year>2012</Year>
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<Day>02</Day>
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<MeshHeading><DescriptorName UI="D000328" MajorTopicYN="N">Adult</DescriptorName>
</MeshHeading>
<MeshHeading><DescriptorName UI="D000368" MajorTopicYN="N">Aged</DescriptorName>
</MeshHeading>
<MeshHeading><DescriptorName UI="D001955" MajorTopicYN="N" Type="Geographic">British Columbia</DescriptorName>
<QualifierName UI="Q000453" MajorTopicYN="N">epidemiology</QualifierName>
</MeshHeading>
<MeshHeading><DescriptorName UI="D002648" MajorTopicYN="N">Child</DescriptorName>
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<MeshHeading><DescriptorName UI="D002675" MajorTopicYN="N">Child, Preschool</DescriptorName>
</MeshHeading>
<MeshHeading><DescriptorName UI="D004196" MajorTopicYN="N">Disease Outbreaks</DescriptorName>
</MeshHeading>
<MeshHeading><DescriptorName UI="D005191" MajorTopicYN="N">Family Characteristics</DescriptorName>
</MeshHeading>
<MeshHeading><DescriptorName UI="D005260" MajorTopicYN="N">Female</DescriptorName>
</MeshHeading>
<MeshHeading><DescriptorName UI="D006801" MajorTopicYN="N">Humans</DescriptorName>
</MeshHeading>
<MeshHeading><DescriptorName UI="D015994" MajorTopicYN="N">Incidence</DescriptorName>
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<MeshHeading><DescriptorName UI="D007223" MajorTopicYN="N">Infant</DescriptorName>
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<MeshHeading><DescriptorName UI="D053118" MajorTopicYN="N">Influenza A Virus, H1N1 Subtype</DescriptorName>
<QualifierName UI="Q000235" MajorTopicYN="N">genetics</QualifierName>
<QualifierName UI="Q000302" MajorTopicYN="Y">isolation & purification</QualifierName>
</MeshHeading>
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<QualifierName UI="Q000453" MajorTopicYN="Y">epidemiology</QualifierName>
<QualifierName UI="Q000635" MajorTopicYN="Y">transmission</QualifierName>
<QualifierName UI="Q000821" MajorTopicYN="N">virology</QualifierName>
</MeshHeading>
<MeshHeading><DescriptorName UI="D008297" MajorTopicYN="N">Male</DescriptorName>
</MeshHeading>
<MeshHeading><DescriptorName UI="D008875" MajorTopicYN="N">Middle Aged</DescriptorName>
</MeshHeading>
<MeshHeading><DescriptorName UI="D058873" MajorTopicYN="N">Pandemics</DescriptorName>
</MeshHeading>
<MeshHeading><DescriptorName UI="D012307" MajorTopicYN="N">Risk Factors</DescriptorName>
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