Avian influenza – A review for doctors in travel medicine
Identifieur interne : 000C27 ( Pmc/Corpus ); précédent : 000C26; suivant : 000C28Avian influenza – A review for doctors in travel medicine
Auteurs : W. R. J. Taylor ; E. Burhan ; H. Wertheim ; P. Z. Soepandi ; P. Horby ; A. Fox ; R. Benamore ; L. De Simone ; T. T. Hien ; F. ChappuisSource :
- Travel Medicine and Infectious Disease [ 1477-8939 ] ; 2009.
Abstract
First identified in humans in Hong Kong, influenza A/H5N1, known commonly as avian influenza, has caused human disease in 15 countries around the world. Although the current number of confirmed patients is tiny compared to seasonal and the recently emerged H1N1 ‘swine’ influenza, H5N1 remains a candidate for the next highly pathogenic influenza pandemic. Currently, H5N1 has very limited ability to spread from person-to-person but this may change because of mutation or reassortment with other influenza viruses leading to an influenza pandemic with high mortality. If this occurs travellers are likely to be affected and travel medicine doctors will need to consider avian influenza in returning febrile travellers. The early clinical features may be dismissed easily as ‘the flu’ resulting in delayed treatment. Treatment options are limited. Oral oseltamivir alone has been the most commonly used drug but mortality remains substantial, up to 80% in Indonesia. Intravenous peramivir has been filed for registration and IV zanamivir is being developed. This review will focus on the epidemiological and clinical features of influenza A/H5N1 avian influenza and will highlight aspects relevant to travel medicine doctors.
Url:
DOI: 10.1016/j.tmaid.2009.11.006
PubMed: 20188299
PubMed Central: 7106094
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PMC:7106094Le document en format XML
<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Avian influenza – A review for doctors in travel medicine</title><author><name sortKey="Taylor, W R J" sort="Taylor, W R J" uniqKey="Taylor W" first="W. R. J." last="Taylor">W. R. J. Taylor</name><affiliation><nlm:aff id="aff1">Oxford University Clinical Research Unit, National Institute for Infectious and Tropical Medicine, 78 Giai Street, Hanoi, Viet Nam</nlm:aff></affiliation><affiliation><nlm:aff id="aff2">Service de Médecine Internationale et Humanitaire, Hôpitaux Universitaires de Genève, rue Micheli-du-Crest 24, 1211, Genève 14, Switzerland</nlm:aff></affiliation></author><author><name sortKey="Burhan, E" sort="Burhan, E" uniqKey="Burhan E" first="E." last="Burhan">E. Burhan</name><affiliation><nlm:aff id="aff3">Departemen Pulmonologi dan Ilmu Kedokteran Respirasi FKUI, Rumah Sakit Persahabatan, Jakarta, Indonesia</nlm:aff></affiliation></author><author><name sortKey="Wertheim, H" sort="Wertheim, H" uniqKey="Wertheim H" first="H." last="Wertheim">H. Wertheim</name><affiliation><nlm:aff id="aff1">Oxford University Clinical Research Unit, National Institute for Infectious and Tropical Medicine, 78 Giai Street, Hanoi, Viet Nam</nlm:aff></affiliation></author><author><name sortKey="Soepandi, P Z" sort="Soepandi, P Z" uniqKey="Soepandi P" first="P. Z." last="Soepandi">P. Z. Soepandi</name><affiliation><nlm:aff id="aff3">Departemen Pulmonologi dan Ilmu Kedokteran Respirasi FKUI, Rumah Sakit Persahabatan, Jakarta, Indonesia</nlm:aff></affiliation></author><author><name sortKey="Horby, P" sort="Horby, P" uniqKey="Horby P" first="P." last="Horby">P. Horby</name><affiliation><nlm:aff id="aff1">Oxford University Clinical Research Unit, National Institute for Infectious and Tropical Medicine, 78 Giai Street, Hanoi, Viet Nam</nlm:aff></affiliation></author><author><name sortKey="Fox, A" sort="Fox, A" uniqKey="Fox A" first="A." last="Fox">A. Fox</name><affiliation><nlm:aff id="aff1">Oxford University Clinical Research Unit, National Institute for Infectious and Tropical Medicine, 78 Giai Street, Hanoi, Viet Nam</nlm:aff></affiliation></author><author><name sortKey="Benamore, R" sort="Benamore, R" uniqKey="Benamore R" first="R." last="Benamore">R. Benamore</name><affiliation><nlm:aff id="aff4">Surgery and Diagnostics Centre, Churchill Hospital, Headington, Oxford, UK</nlm:aff></affiliation></author><author><name sortKey="De Simone, L" sort="De Simone, L" uniqKey="De Simone L" first="L." last="De Simone">L. De Simone</name><affiliation><nlm:aff id="aff5">Geo-Spatial Analyst Infectious Diseases/EMPRES Group, Food and Agriculture Organization, Viale delle Terme di Caracalla, 00100 Rome, Italy</nlm:aff></affiliation></author><author><name sortKey="Hien, T T" sort="Hien, T T" uniqKey="Hien T" first="T. T." last="Hien">T. T. Hien</name><affiliation><nlm:aff id="aff6">Oxford University Clinical Research Unit, Hospital for Tropical Diseases, Ho Chi Minh, Viet Nam</nlm:aff></affiliation></author><author><name sortKey="Chappuis, F" sort="Chappuis, F" uniqKey="Chappuis F" first="F." last="Chappuis">F. Chappuis</name><affiliation><nlm:aff id="aff2">Service de Médecine Internationale et Humanitaire, Hôpitaux Universitaires de Genève, rue Micheli-du-Crest 24, 1211, Genève 14, Switzerland</nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">20188299</idno><idno type="pmc">7106094</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7106094</idno><idno type="RBID">PMC:7106094</idno><idno type="doi">10.1016/j.tmaid.2009.11.006</idno><date when="2009">2009</date><idno type="wicri:Area/Pmc/Corpus">000C27</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">000C27</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Avian influenza – A review for doctors in travel medicine</title><author><name sortKey="Taylor, W R J" sort="Taylor, W R J" uniqKey="Taylor W" first="W. R. J." last="Taylor">W. R. J. Taylor</name><affiliation><nlm:aff id="aff1">Oxford University Clinical Research Unit, National Institute for Infectious and Tropical Medicine, 78 Giai Street, Hanoi, Viet Nam</nlm:aff></affiliation><affiliation><nlm:aff id="aff2">Service de Médecine Internationale et Humanitaire, Hôpitaux Universitaires de Genève, rue Micheli-du-Crest 24, 1211, Genève 14, Switzerland</nlm:aff></affiliation></author><author><name sortKey="Burhan, E" sort="Burhan, E" uniqKey="Burhan E" first="E." last="Burhan">E. Burhan</name><affiliation><nlm:aff id="aff3">Departemen Pulmonologi dan Ilmu Kedokteran Respirasi FKUI, Rumah Sakit Persahabatan, Jakarta, Indonesia</nlm:aff></affiliation></author><author><name sortKey="Wertheim, H" sort="Wertheim, H" uniqKey="Wertheim H" first="H." last="Wertheim">H. Wertheim</name><affiliation><nlm:aff id="aff1">Oxford University Clinical Research Unit, National Institute for Infectious and Tropical Medicine, 78 Giai Street, Hanoi, Viet Nam</nlm:aff></affiliation></author><author><name sortKey="Soepandi, P Z" sort="Soepandi, P Z" uniqKey="Soepandi P" first="P. Z." last="Soepandi">P. Z. Soepandi</name><affiliation><nlm:aff id="aff3">Departemen Pulmonologi dan Ilmu Kedokteran Respirasi FKUI, Rumah Sakit Persahabatan, Jakarta, Indonesia</nlm:aff></affiliation></author><author><name sortKey="Horby, P" sort="Horby, P" uniqKey="Horby P" first="P." last="Horby">P. Horby</name><affiliation><nlm:aff id="aff1">Oxford University Clinical Research Unit, National Institute for Infectious and Tropical Medicine, 78 Giai Street, Hanoi, Viet Nam</nlm:aff></affiliation></author><author><name sortKey="Fox, A" sort="Fox, A" uniqKey="Fox A" first="A." last="Fox">A. Fox</name><affiliation><nlm:aff id="aff1">Oxford University Clinical Research Unit, National Institute for Infectious and Tropical Medicine, 78 Giai Street, Hanoi, Viet Nam</nlm:aff></affiliation></author><author><name sortKey="Benamore, R" sort="Benamore, R" uniqKey="Benamore R" first="R." last="Benamore">R. Benamore</name><affiliation><nlm:aff id="aff4">Surgery and Diagnostics Centre, Churchill Hospital, Headington, Oxford, UK</nlm:aff></affiliation></author><author><name sortKey="De Simone, L" sort="De Simone, L" uniqKey="De Simone L" first="L." last="De Simone">L. De Simone</name><affiliation><nlm:aff id="aff5">Geo-Spatial Analyst Infectious Diseases/EMPRES Group, Food and Agriculture Organization, Viale delle Terme di Caracalla, 00100 Rome, Italy</nlm:aff></affiliation></author><author><name sortKey="Hien, T T" sort="Hien, T T" uniqKey="Hien T" first="T. T." last="Hien">T. T. Hien</name><affiliation><nlm:aff id="aff6">Oxford University Clinical Research Unit, Hospital for Tropical Diseases, Ho Chi Minh, Viet Nam</nlm:aff></affiliation></author><author><name sortKey="Chappuis, F" sort="Chappuis, F" uniqKey="Chappuis F" first="F." last="Chappuis">F. Chappuis</name><affiliation><nlm:aff id="aff2">Service de Médecine Internationale et Humanitaire, Hôpitaux Universitaires de Genève, rue Micheli-du-Crest 24, 1211, Genève 14, Switzerland</nlm:aff></affiliation></author></analytic><series><title level="j">Travel Medicine and Infectious Disease</title><idno type="ISSN">1477-8939</idno><idno type="eISSN">1873-0442</idno><imprint><date when="2009">2009</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><title>Summary</title><p>First identified in humans in Hong Kong, influenza A/H5N1, known commonly as avian influenza, has caused human disease in 15 countries around the world. Although the current number of confirmed patients is tiny compared to seasonal and the recently emerged H1N1 ‘swine’ influenza, H5N1 remains a candidate for the next highly pathogenic influenza pandemic. Currently, H5N1 has very limited ability to spread from person-to-person but this may change because of mutation or reassortment with other influenza viruses leading to an influenza pandemic with high mortality. If this occurs travellers are likely to be affected and travel medicine doctors will need to consider avian influenza in returning febrile travellers. The early clinical features may be dismissed easily as ‘the flu’ resulting in delayed treatment. Treatment options are limited. Oral oseltamivir alone has been the most commonly used drug but mortality remains substantial, up to 80% in Indonesia. Intravenous peramivir has been filed for registration and IV zanamivir is being developed. 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<front><journal-meta><journal-id journal-id-type="nlm-ta">Travel Med Infect Dis</journal-id><journal-id journal-id-type="iso-abbrev">Travel Med Infect Dis</journal-id><journal-title-group><journal-title>Travel Medicine and Infectious Disease</journal-title></journal-title-group><issn pub-type="ppub">1477-8939</issn><issn pub-type="epub">1873-0442</issn><publisher><publisher-name>Elsevier Ltd.</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">20188299</article-id><article-id pub-id-type="pmc">7106094</article-id><article-id pub-id-type="publisher-id">S1477-8939(09)00162-8</article-id><article-id pub-id-type="doi">10.1016/j.tmaid.2009.11.006</article-id><article-categories><subj-group subj-group-type="heading"><subject>Article</subject></subj-group></article-categories><title-group><article-title>Avian influenza – A review for doctors in travel medicine</article-title></title-group><contrib-group><contrib contrib-type="author" id="au1"><name><surname>Taylor</surname><given-names>W.R.J.</given-names></name><email>bob@tropmedres.ac</email><xref rid="aff1" ref-type="aff">a</xref><xref rid="aff2" ref-type="aff">b</xref><xref rid="cor1" ref-type="corresp">∗</xref></contrib><contrib contrib-type="author" id="au2"><name><surname>Burhan</surname><given-names>E.</given-names></name><xref rid="aff3" ref-type="aff">c</xref></contrib><contrib contrib-type="author" id="au3"><name><surname>Wertheim</surname><given-names>H.</given-names></name><xref rid="aff1" ref-type="aff">a</xref></contrib><contrib contrib-type="author" id="au4"><name><surname>Soepandi</surname><given-names>P.Z.</given-names></name><xref rid="aff3" ref-type="aff">c</xref></contrib><contrib contrib-type="author" id="au5"><name><surname>Horby</surname><given-names>P.</given-names></name><xref rid="aff1" ref-type="aff">a</xref></contrib><contrib contrib-type="author" id="au6"><name><surname>Fox</surname><given-names>A.</given-names></name><xref rid="aff1" ref-type="aff">a</xref></contrib><contrib contrib-type="author" id="au7"><name><surname>Benamore</surname><given-names>R.</given-names></name><xref rid="aff4" ref-type="aff">d</xref></contrib><contrib contrib-type="author" id="au8"><name><surname>de Simone</surname><given-names>L.</given-names></name><xref rid="aff5" ref-type="aff">e</xref></contrib><contrib contrib-type="author" id="au9"><name><surname>Hien</surname><given-names>T.T.</given-names></name><xref rid="aff6" ref-type="aff">f</xref></contrib><contrib contrib-type="author" id="au10"><name><surname>Chappuis</surname><given-names>F.</given-names></name><xref rid="aff2" ref-type="aff">b</xref></contrib></contrib-group><aff id="aff1"><label>a</label>Oxford University Clinical Research Unit, National Institute for Infectious and Tropical Medicine, 78 Giai Street, Hanoi, Viet Nam</aff><aff id="aff2"><label>b</label>Service de Médecine Internationale et Humanitaire, Hôpitaux Universitaires de Genève, rue Micheli-du-Crest 24, 1211, Genève 14, Switzerland</aff><aff id="aff3"><label>c</label>Departemen Pulmonologi dan Ilmu Kedokteran Respirasi FKUI, Rumah Sakit Persahabatan, Jakarta, Indonesia</aff><aff id="aff4"><label>d</label>Surgery and Diagnostics Centre, Churchill Hospital, Headington, Oxford, UK</aff><aff id="aff5"><label>e</label>Geo-Spatial Analyst Infectious Diseases/EMPRES Group, Food and Agriculture Organization, Viale delle Terme di Caracalla, 00100 Rome, Italy</aff><aff id="aff6"><label>f</label>Oxford University Clinical Research Unit, Hospital for Tropical Diseases, Ho Chi Minh, Viet Nam</aff><author-notes><corresp id="cor1"><label>∗</label>Corresponding author. MORU, Faculty of Tropical Medicine, Mahidol University, 420/6 Rajvithi Rd, Bangkok 10400, Thailand. Tel.: +66 22036333. <email>bob@tropmedres.ac</email></corresp></author-notes><pub-date pub-type="pmc-release"><day>1</day><month>12</month><year>2009</year></pub-date><pmc-comment> PMC Release delay is 0 months and 0 days and was based on .</pmc-comment>
<pub-date pub-type="ppub"><month>1</month><year>2010</year></pub-date><pub-date pub-type="epub"><day>1</day><month>12</month><year>2009</year></pub-date><volume>8</volume><issue>1</issue><fpage>1</fpage><lpage>12</lpage><history><date date-type="received"><day>29</day><month>10</month><year>2009</year></date><date date-type="rev-recd"><day>10</day><month>11</month><year>2009</year></date><date date-type="accepted"><day>10</day><month>11</month><year>2009</year></date></history><permissions><copyright-statement>Copyright © 2009 Elsevier Ltd. All rights reserved.</copyright-statement><copyright-year>2009</copyright-year><copyright-holder>Elsevier Ltd</copyright-holder><license><license-p>Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.</license-p></license></permissions><abstract><title>Summary</title><p>First identified in humans in Hong Kong, influenza A/H5N1, known commonly as avian influenza, has caused human disease in 15 countries around the world. Although the current number of confirmed patients is tiny compared to seasonal and the recently emerged H1N1 ‘swine’ influenza, H5N1 remains a candidate for the next highly pathogenic influenza pandemic. Currently, H5N1 has very limited ability to spread from person-to-person but this may change because of mutation or reassortment with other influenza viruses leading to an influenza pandemic with high mortality. If this occurs travellers are likely to be affected and travel medicine doctors will need to consider avian influenza in returning febrile travellers. The early clinical features may be dismissed easily as ‘the flu’ resulting in delayed treatment. Treatment options are limited. Oral oseltamivir alone has been the most commonly used drug but mortality remains substantial, up to 80% in Indonesia. Intravenous peramivir has been filed for registration and IV zanamivir is being developed. This review will focus on the epidemiological and clinical features of influenza A/H5N1 avian influenza and will highlight aspects relevant to travel medicine doctors.</p></abstract><kwd-group><title>Keywords</title><kwd>Avian influenza</kwd><kwd>Travellers</kwd><kwd>H5N1</kwd><kwd>ARDS</kwd></kwd-group></article-meta></front><body><sec id="sec1"><title>Introduction</title><p id="para0160">Avian influenza due to the influenza A/H5N1 virus has emerged as a potential global threat.<xref rid="bib1" ref-type="bibr"><sup>1</sup></xref> The H5N1 virus joins a list of other respiratory pathogens that have emerged in the past 40 years and which often cause severe clinical disease like <italic>Legionella pneumophila</italic>, SARS coronavirus and Hanta virus pulmonary syndrome.<xref rid="bib2" ref-type="bibr">2</xref>, <xref rid="bib3" ref-type="bibr">3</xref>, <xref rid="bib4" ref-type="bibr">4</xref></p><p id="para0165">When a new pathogen emerges and causes a high mortality, much angst is generated globally. The main question is whether there is potential for efficient spread from person-to-person and, therefore, the risk of an epidemic or pandemic. To date, person-to-person transmission of H5N1 has been very rare and associated with close human contact.<xref rid="bib5" ref-type="bibr"><sup>5</sup></xref> Never the less, the threat remains that H5N1 may cause the next pandemic with substantial mortality.</p><p id="para0170">The global spread of avian influenza has been through the poultry trade and infected birds and many countries have experienced poultry outbreaks (<xref rid="fig1" ref-type="fig">Fig. 1</xref>). By contrast, the SARS epidemic and the current (2009) pandemic of H1N1 swine influenza are good examples of how global travel played an important role in the spread of these two viruses.<xref rid="bib3" ref-type="bibr">3</xref>, <xref rid="bib6" ref-type="bibr">6</xref> If H5N1 acquired the ability to spread easily, then air travel would be a very efficient way to transport infected passengers and cause outbreaks far from their original source.<fig id="fig1"><label>Figure 1</label><caption><p>Map of the global distribution of poultry outbreaks since the first detection of H5N1 in 2003 to June 2009.</p></caption><graphic xlink:href="gr1_lrg"></graphic></fig></p><p id="para0175">H5N1 infection of humans was first reported in Hong Kong in 1997, causing 6 deaths in 18 confirmed patients. Infected poultry in Hong Kong's wet markets were the likely source.<xref rid="bib7" ref-type="bibr">7</xref>, <xref rid="bib8" ref-type="bibr">8</xref> Mass culling of chickens was necessary to curtail this small epidemic. As of September 2009, H5N1 has been documented and reported to the WHO in 442 patients in 15 countries of which 6 are in SE Asia (<ext-link ext-link-type="uri" xlink:href="http://www.who.int/csr/disease/avianinfluenza/country/casestable200809_10/en/index.htm">www.who.int/csr/disease/avianinfluenza/country/casestable200809_10/en/index.htm</ext-link>, accessed November, 2009). H5N1 infections in wild birds, chickens and other poultry have been reported in 61 countries in Africa, Asia and Europe (<xref rid="fig1" ref-type="fig">Fig. 1</xref>).</p><p id="para0180">The history of influenza pandemics explains the anxiety regarding H5N1. There have been three pandemics of influenza in the past 100 years and the one upper most in our minds is the 1918 pandemic because of its size and high, total mortality of some 40 million people.<xref rid="bib9" ref-type="bibr"><sup>9</sup></xref> Patients of all ages died, including young adults aged 20–40 years. This was a distinct difference from the usual pattern of mortality of seasonal influenza epidemics in which patients at the extremes of age suffer the greatest mortality. A lack of influenza immunity was an important reason for its easy spread and high mortality which has also been attributed to viral genes that facilitate high viral loads, excessive innate inflammatory response and fatal primary viral pneumonia.<xref rid="bib10" ref-type="bibr">10</xref>, <xref rid="bib11" ref-type="bibr">11</xref>, <xref rid="bib12" ref-type="bibr">12</xref>, <xref rid="bib13" ref-type="bibr">13</xref> A recent re-examination of microbiological data and lung tissue from 1918 has suggested strongly that secondary bacterial pneumonia also played a key role in the high mortality.<xref rid="bib14" ref-type="bibr"><sup>14</sup></xref> In 2009, the world is experiencing a fourth pandemic of a novel influenza A/H1N1 virus. Our knowledge of this infection is increasing and important lessons learnt may impact our thinking regarding H5N1.<xref rid="bib15" ref-type="bibr">15</xref>, <xref rid="bib16" ref-type="bibr">16</xref></p><p id="para0185">One theme is common to the three major influenza pandemics and the ‘swine’ flu pandemic; the viruses responsible had an avian link. The H1N1 1918 pandemic is thought to have arisen through the adaptation of an avian like influenza virus that allowed for easy human to human transmission whereas the H2N2 (1957 pandemic) and H3N2 (1968 pandemic) influenza viruses acquired new genes from Eurasian avian viruses by genetic reassortment with the circulating human H1N1 virus.<xref rid="bib9" ref-type="bibr"><sup>9</sup></xref> The 2009 ‘swine’ H1N1 influenza virus is an assortment of avian, human and swine influenza viruses.<xref rid="bib17" ref-type="bibr"><sup>17</sup></xref> Currently, highly pathogenic H5N1 avian influenza virus continues to cause outbreaks in poultry and has gained the ability to jump species and infect humans and other mammals.<xref rid="bib18" ref-type="bibr"><sup>18</sup></xref></p><p id="para0190">The travel medicine doctor may be the first person a sick patient sees when returning from a trip overseas. Although still rare, avian influenza now needs to be on the differential diagnosis in a returning, febrile traveller. Travel medicine doctors often see rare diseases that capture the imagination. However romantic this notion, we should not forget that they are an important early defence in the potential spread of imported infectious diseases.</p><p id="para0195">This review will focus on those aspects of H5N1 pertinent to the travel medicine doctors and will include the epidemiology, clinical features, diagnostics and management of a patient with avian influenza.</p></sec><sec id="sec2"><title>Clinical features</title><p id="para0200">Human influenza is well known as a cause of, usually, a self-limiting infection of the upper respiratory tract. Influenza related mortality is confined generally to the very young, the elderly, the immunocompromised, patients with underlying cardiorespiratory illness and influenza complications, notably, secondary bacterial pneumonia, encephalitis, rhabdomyolysis and myocarditis.<xref rid="bib19" ref-type="bibr">19</xref>, <xref rid="bib20" ref-type="bibr">20</xref>, <xref rid="bib21" ref-type="bibr">21</xref></p><p id="para0205">Avian influenza has important contrasting features. It affects individuals of all ages, causes frequently a severe and rapidly progressive pneumonitis and a high mortality even in fit and healthy patients.<xref rid="bib7" ref-type="bibr">7</xref>, <xref rid="bib22" ref-type="bibr">22</xref> The mean incubation period is 2–3 days with a reported range of 2–9 days. Most cases are clinically manifest within 7 days of exposure to e.g. sick poultry.<xref rid="bib23" ref-type="bibr">23</xref>, <xref rid="bib24" ref-type="bibr">24</xref>, <xref rid="bib25" ref-type="bibr">25</xref> Therefore, a traveller can easily become symptomatic once back in his/her home country or visiting another country where H5N1 may not have occurred.</p><p id="para0210">Most of the clinical experience and published literature are based on hospitalised patients, so the clinical picture is biased towards those with greater illness severity. In general, individual clinical series have been small (<30 patients) but two larger studies have been published recently from Indonesia (<italic>n</italic> = 127) and Vietnam (<italic>n</italic> = 67).<xref rid="bib26" ref-type="bibr">26</xref>, <xref rid="bib27" ref-type="bibr">27</xref> Clearly, combining all these disparate databases would be helpful to define better the clinical features of the disease, assess robustly poor prognostic factors and enhance our ability to conduct clinical research.</p></sec><sec id="sec3"><title>Symptoms and signs</title><p id="para0215">Our knowledge of the early stages of H5N1 is somewhat scant because most series are from hospitalised patients with advanced disease. The best data are from the series of Kandun et al. The majority of patients reported a mild prodromal phase characterised by fever, cough and runny nose. Only a minority (9%) complained of early dyspnoea; a clinical picture that may easily be dismissed as the common cold or another infectious disease prevalent in that setting.<xref rid="bib26" ref-type="bibr">26</xref>, <xref rid="bib28" ref-type="bibr">28</xref> As a result, patients may have visited several clinics or hospitals before the proverbial ‘penny drops’.<xref rid="bib27" ref-type="bibr">27</xref>, <xref rid="bib29" ref-type="bibr">29</xref>, <xref rid="bib30" ref-type="bibr">30</xref> With this time delay, the clinical picture is likely to have progressed significantly when cough (88%) and dyspnoea (84%) dominate the clinical picture.<xref rid="bib26" ref-type="bibr"><sup>26</sup></xref> Missing the diagnosis of a patient with a non descript febrile illness is not new in travel medicine and has occurred in patients with early malaria, a disease that is often placed first in the differential diagnosis of a fever in a traveller.<xref rid="bib31" ref-type="bibr">31</xref>, <xref rid="bib32" ref-type="bibr">32</xref></p><p id="para0220">The prodromal symptoms of H5N1 are followed by increasing shortness of breath that may become incapacitating within several days, necessitating hospital admission. However, a minority of patients do not develop severe disease and have an otherwise mild course that has responded well to oseltamivir.<xref rid="bib7" ref-type="bibr">7</xref>, <xref rid="bib22" ref-type="bibr">22</xref> Other reported symptoms have included myalgia (13%), headache (13%), vomiting (16%), diarrhoea (14%), nausea (7%), epigastric pain (4%), convulsion (2%) and constipation (2%).<xref rid="bib22" ref-type="bibr">22</xref>, <xref rid="bib26" ref-type="bibr">26</xref></p><p id="para0225">Physical signs depend on the severity of illness at presentation and may include fever, tachypnoea, dyspnoea, tachycardia, a normal or low blood pressure, and inspiratory crepitations; wheezes may also be heard but less frequently than crepitations. Signs of a pleural effusion may also be present. In our experience, pneumothoraces have generally occurred during mechanical or noninvasive ventilation but have also occurred in non ventilated patients; cutaneous crepitus may be found. There are no human data on the possible occurrence of H5N1 induced myocarditis.</p><p id="para0230">As patients deteriorate clinically, their degree of respiratory failure often worsens and they develop the acute respiratory distress syndrome (ARDS); this has occurred between 4 and 13 days (median 6 days) of illness.<xref rid="bib24" ref-type="bibr">24</xref>, <xref rid="bib33" ref-type="bibr">33</xref>, <xref rid="bib34" ref-type="bibr">34</xref> We have not seen acute renal failure requiring haemofiltration or haemodialysis nor the classic signs of acute hepatic failure. In <10% of patients, there is spontaneous bleeding from mucosal or venepuncture sites.<xref rid="bib24" ref-type="bibr">24</xref>, <xref rid="bib27" ref-type="bibr">27</xref>, <xref rid="bib35" ref-type="bibr">35</xref></p><p id="para0235">Patients usually die of progressive respiratory failure, a number of whom are also on inotropic support for hypotension. Death has occurred between 6 and 16 days of illness.<xref rid="bib23" ref-type="bibr">23</xref>, <xref rid="bib26" ref-type="bibr">26</xref>, <xref rid="bib35" ref-type="bibr">35</xref> Some patients have responded favourably to oseltamivir and cleared their H5N1 virus only to die of a ventilator associated pneumonia due to e.g. by multi drug resistant <italic>Acinetobacter baumanii</italic>.</p><p id="para0240">Although a predominantly respiratory illness, clinicians should be aware of atypical, nonrespiratory presentations. Case reports have documented a child who first presented with severe diarrhoea followed by convulsions and coma<xref rid="bib36" ref-type="bibr"><sup>36</sup></xref> and an adult female who presented with ‘gastroenteritis’ followed by severe pneumonia.<xref rid="bib37" ref-type="bibr"><sup>37</sup></xref> Both died.</p></sec><sec id="sec4"><title>Laboratory results</title><p id="para0245">The full blood count in most patients shows either a normal haemoglobin or a mild anaemia. White cell count abnormalities are common. Leukopenia, defined as either a total white cell count <5000 or 4000/μL occurs in 27–84%, lymphopenia [<1000 (>7 years) to <1500/μL (2 to ≤6 years)] in 16–55%, any degree of neutropenia (<2000 or <2200/μL) in 30–50% of patients in Vietnam and Indonesia, severe neutropenia (<1000/μL) in <10%. Thrombocytopenia (platelet count <150,000/μL) is common (31–64%)<xref rid="bib22" ref-type="bibr">22</xref>, <xref rid="bib35" ref-type="bibr">35</xref> and severe thrombocytopenia (<50,000/μL) affected 10% of Indonesian patients.<xref rid="bib30" ref-type="bibr"><sup>30</sup></xref></p><p id="para0250">Using the International Society of Thrombosis and Homeostasis definition,<xref rid="bib38" ref-type="bibr"><sup>38</sup></xref> disseminated intravascular coagulation is present in up to 20–25% of patients but spontaneous bleeding from mucosal or venepuncture sites is reported in <10%.<xref rid="bib24" ref-type="bibr">24</xref>, <xref rid="bib27" ref-type="bibr">27</xref>, <xref rid="bib35" ref-type="bibr">35</xref> A number of patients may have raised d-dimers but normal PTs and aPTTs with a low or normal fibrinogen concentrations, consistent with H5N1 fibrinolysis.<xref rid="bib24" ref-type="bibr">24</xref>, <xref rid="bib30" ref-type="bibr">30</xref></p><p id="para0255">Liver enzymes are generally moderately elevated with higher AST (3–10 × ULN) values compared to ALT (up to 4 × ULN) values; AST and ALT values exceeding 1000 and 400, respectively, have been seen in some patients. Where measured the lactate dehydrogenase (LDH) has also been high (2–10 × ULN) and is most likely to be of lung origin.<xref rid="bib27" ref-type="bibr">27</xref>, <xref rid="bib33" ref-type="bibr">33</xref>, <xref rid="bib35" ref-type="bibr">35</xref></p><p id="para0260">The serum creatinine may be mild or moderately raised and urine microscopy, where reported, has been unremarkable aside from proteinuria and microscopic haematuria. The creatinine phosphokinase (CPK) may be raised up to 10 fold above the upper limit of normal but acute rhabdomyolysis with myoglobinuria and renal impairment have not yet been reported. There are no published data on the CPKmb fraction or on cardiac troponins. Raised blood glucose concentrations in patients without known diabetes mellitus have been observed at presentation, consistent with a stress induced hyperglycaemia, and during hospital admission, usually in association with steroid use and have required intravenous insulin treatment in some patients.<xref rid="bib24" ref-type="bibr">24</xref>, <xref rid="bib28" ref-type="bibr">28</xref>, <xref rid="bib34" ref-type="bibr">34</xref>, <xref rid="bib35" ref-type="bibr">35</xref></p><p id="para0265">Pleural fluid may be straw coloured or haemorrhagic with high total protein and LDH concentrations, meeting the Light criteria for an exudate, and may be H5N1 positive.<xref rid="bib30" ref-type="bibr">30</xref>, <xref rid="bib39" ref-type="bibr">39</xref></p></sec><sec id="sec5"><title>Radiology</title><p id="para0270">Radiographic pneumonia has occurred in almost all hospitalised patients but these changes are not H5N1 specific. Chest X-ray (CXR) shadowing has included diffuse, multi-focal or patchy infiltrates, interstitial infiltrates, lobular consolidation with air bronchograms, pneumothoraces and pneumomediastina.<xref rid="bib40" ref-type="bibr">40</xref>, <xref rid="bib41" ref-type="bibr">41</xref> Sequential CXR shadows may worsen in parallel with the clinical state of the patient (<xref rid="fig3" ref-type="fig">Fig. 3</xref>). Findings on chest CT scan have been consistent but have also shown destroyed lung architecture, persistent ground glass attenuation, segmental consolidation, pseudocavitation, pneumatoceles, lymphadenopathy, centrilobular nodules and post recovery fibrosis (<xref rid="fig3" ref-type="fig">Fig. 3</xref>).<fig id="fig2"><label>Figure 2</label><caption><p>Ducks in a wet market in Hanoi, Vietnam.</p></caption><graphic xlink:href="gr2_lrg"></graphic><attrib>Downloaded from the Food and Agriculture Organisation web site (<ext-link ext-link-type="uri" xlink:href="http://www.fao.org">http://www.fao.org</ext-link>).</attrib></fig><fig id="fig3"><label>Figure 3</label><caption><p>Chest X-ray series in an adult male patient with fatal H5N1. He was admitted after 8 days of illness. Admission (D0) CXR shows opacification in the right mid zone, outlining the horizontal fissure and obscuring the right heart border, in keeping with middle lobe consolidation. On Day 1 there has been development of additional right lower lobe consolidation, as demonstrated by obscuration of the right hemidiaphragm. By Day 2, the patient has been intubated; there is now complete opacification of the right hemithorax and left perihilar consolidation, likely representing additional pulmonary oedema. There has been little radiographic change at Day 3. No CXR was done on Day 4. Day 5: the parenchymal opacification is stable but there is now a moderate right pleural effusion. He died on Day 6.</p></caption><graphic xlink:href="gr3_lrg"></graphic></fig></p></sec><sec id="sec6"><title>Poor prognostic features</title><p id="para0275">There are many reported poor prognostic factors. Delayed oseltamivir treatment was an important, independent factor in the 127 patient Indonesian series.<xref rid="bib26" ref-type="bibr"><sup>26</sup></xref> Many other factors have not been robustly tested for independence in multivariate analyses but they are probably useful clinical pointers: (i) admission leukopenia, lymphopenia, neutropenia, thrombocytopenia, (ii) increased LDH on admission, (iii) no oseltamivir/other antiviral treatment, (iv) the use of corticosteroids, (v) bilateral CXR shadowing, (vi) the development of ARDS, (vii) blood positive for H5N1 (H5N1 viraemia) and (viii) high cytokine concentrations.<xref rid="bib7" ref-type="bibr">7</xref>, <xref rid="bib23" ref-type="bibr">23</xref>, <xref rid="bib26" ref-type="bibr">26</xref>, <xref rid="bib28" ref-type="bibr">28</xref>, <xref rid="bib33" ref-type="bibr">33</xref>, <xref rid="bib35" ref-type="bibr">35</xref>, <xref rid="bib42" ref-type="bibr">42</xref> Data from Indonesia suggest hyperglycaemia and raised d-dimers are also poor prognostic factors.<xref rid="bib30" ref-type="bibr"><sup>30</sup></xref></p><p id="para0280">H5N1 infections have caused high mortality across all age groups. In some clinical series, younger patients have experienced a higher mortality which may be due to cross protective immunity from previous human influenza in older individuals.<xref rid="bib33" ref-type="bibr"><sup>33</sup></xref></p></sec><sec id="sec7"><title>Transmission</title><p id="para0285">The main route of transmission of H5N1 from poultry to humans is probably via the respiratory tract but the eye, via the conjunctival mucosa, and gut are other possible routes. Infection through the gut could occur by licking contaminated fingers or swallowing water contaminated by poultry infected faeces. Poultry excrete large amounts of H5N1 virus in their faeces that can survive in soil and water.<xref rid="bib43" ref-type="bibr">43</xref>, <xref rid="bib44" ref-type="bibr">44</xref> Poultry faeces is used as a fertiliser and fish feed in some countries.<xref rid="bib1" ref-type="bibr"><sup>1</sup></xref></p><p id="para0290">Close contact with chickens or direct handling of infected, poultry faeces represents a risk factor for infection. In the H5N1 outbreak in Turkey, some children shared their living space with the infected chickens<xref rid="bib24" ref-type="bibr"><sup>24</sup></xref> and in SE Asia, where home rearing of poultry is common, chickens and ducks may gather to deposit their faeces in ponds which are commonly used by children for bathing and playing.<xref rid="bib45" ref-type="bibr"><sup>45</sup></xref> Infected poultry may appear well yet be excreting virus in the environment. So apparently healthy poultry pose a risk.</p><p id="para0295">Infected individuals who visited wet markets (<xref rid="fig2" ref-type="fig">Fig. 2</xref>) where infected poultry were sold developed H5N1 about one week later.<xref rid="bib46" ref-type="bibr">46</xref>, <xref rid="bib47" ref-type="bibr">47</xref>, <xref rid="bib48" ref-type="bibr">48</xref> Determining how they became infected is speculative but could have been self-inoculation of the respiratory tract after touching H5N1-contaminated surfaces, or eggs or inhalation of aerosolized debris containing H5N1 virus.</p><p id="para0300">Human to human transmission has been documented rarely and usually after close and prolonged contact in persons of the same familial bloodline (e.g. father to son).<xref rid="bib5" ref-type="bibr">5</xref>, <xref rid="bib26" ref-type="bibr">26</xref>, <xref rid="bib49" ref-type="bibr">49</xref> Nosocomial transmission, manifest as asymptomatic seroconversion, is also rare but this does not obviate the need for good infection control practices.<xref rid="bib50" ref-type="bibr">50</xref>, <xref rid="bib51" ref-type="bibr">51</xref>, <xref rid="bib52" ref-type="bibr">52</xref>, <xref rid="bib53" ref-type="bibr">53</xref> Importantly, in about a quarter of patients, there is no history of a high risk exposure; so, a lack of a history of a high risk exposure does not exclude the possibility of H5N1.</p></sec><sec id="sec8"><title>Pretravel advice</title><p id="para0305">H5N1 is a cosmopolitan disease (<xref rid="fig1" ref-type="fig">Fig. 1</xref>). Three countries account for three quarters of the cases reported to the WHO: Indonesia, Vietnam and Egypt. Other avian viruses may also cause outbreaks, most notably, the 2003 H7N7 outbreak in Holland that affected 89 individuals and resulted in one death.<xref rid="bib54" ref-type="bibr">54</xref>, <xref rid="bib55" ref-type="bibr">55</xref> Given the increased awareness of H5N1, other highly pathogenic viruses like Corona SARS, and more recently the ‘swine’ flu pandemic, travellers are very likely to ask how to protect themselves.</p><p id="para0310">The overall risk of travellers contracting H5N1 is very low. There are currently no travel restrictions to countries where bird or human cases have been or are being reported, and travellers are not recommended to carry standby oseltamivir. Nevertheless, it remains important to advise individual travellers so they are aware of the behaviours or exposures that have led to H5N1 disease in local populations. There is currently no readily available vaccine against H5N1 but a number have received regulatory approval.<xref rid="bib56" ref-type="bibr"><sup>56</sup></xref> Vaccination against seasonal influenza should be considered for travellers at high risk of influenza complications, consistent with many national guidelines. Seasonal influenza vaccines do not offer protection against H5N1 so travellers should be advised of this. There are no data on the emerging 2009 ‘swine’ H1N1 vaccines.</p><p id="para0315">General advice (<xref rid="tbox1" ref-type="boxed-text">Box 1</xref>) includes staying away from dead or live birds and poultry, like chickens, turkeys, geese, ducks and quail.<xref rid="bib57" ref-type="bibr"><sup>57</sup></xref> This applies especially to children who may wish to play with their new found friends. For travellers who end up in wet markets, avoiding direct contact with chickens, ducks, eggs, dirty cages and slaughtering counters etc is wise. “Take your photographs from a distance, use the zoom function!” might be sensible advice. Well cooked poultry and eggs do not pose a threat to health but H5N1 virus can be detected in raw eggs. Good hand hygiene remains an important preventative measure and some travellers may wish to purchase commercially available hand sanitisers that are effective against H5N1 and other influenza viruses.<boxed-text id="tbox1"><label>Box 1</label><caption><title>An adaptation of advice offered to travellers by the UK Health Protection Agency and the US CDC (http://www.hpa.org.uk, http://wwwn.cdc.gov/travel/contentAvianFluAsia.aspx).</title></caption><p id="para0005"><list list-type="simple" id="list0005"><list-item id="list-item0005"><p id="para0010">Be careful with birds<list list-type="simple" id="list0010"><list-item id="list-item0010"><p id="para0015">Avoid visiting live animal markets and poultry farms</p></list-item><list-item id="list-item0015"><p id="para0020">Avoid all direct contact with birds, including poultry (such as chickens and ducks) and wild birds.</p></list-item><list-item id="list-item0020"><p id="para0025">Avoid touching surfaces that have bird droppings (faeces) or other bird fluids on them.</p></list-item><list-item id="list-item0025"><p id="para0030">Avoid places such as poultry farms and bird markets where live birds are raised or kept.</p></list-item><list-item id="list-item0030"><p id="para0035">Do not pick up or touch dead or dying birds</p></list-item><list-item id="list-item0035"><p id="para0040">Do not eat or handle undercooked or raw poultry, egg, poultry blood or duck dishes</p></list-item><list-item id="list-item0040"><p id="para0045">Eat only bird meat or products that have been thoroughly cooked.</p></list-item><list-item id="list-item0045"><p id="para0050">Egg yolks should not be runny or liquid.</p></list-item><list-item id="list-item0050"><p id="para0055">Do not attempt to bring any live poultry products back to the UK</p></list-item></list></p></list-item><list-item id="list-item0055"><p id="para0060">Practice healthy habits to help stop the spread of germs<list list-type="simple" id="list0015"><list-item id="list-item0060"><p id="para0065">Wash your hands often with soap and clean water.</p></list-item><list-item id="list-item0065"><p id="para0070">This removes germs from your skin and helps prevent diseases from spreading.</p></list-item><list-item id="list-item0070"><p id="para0075">Use waterless alcohol-based hand gels (containing at least 60% alcohol) when soap and clean water are not available and hands are not visibly dirty.</p></list-item><list-item id="list-item0075"><p id="para0080">Seek medical care if you feel sick</p></list-item><list-item id="list-item0080"><p id="para0085">If you become sick with a fever plus a cough and sore throat, or have trouble breathing, seek medical care right away. Tell the doctor if you have had contact with sick or dead birds.</p></list-item></list></p></list-item></list></p></boxed-text></p><p id="para0320">If a traveller develops a febrile illness, he/she should seek medical advice early and report any potential exposure to chickens and other poultry, even if only fleetingly.</p><p id="para0325">Several airborne transmitted diseases like tuberculosis and human influenza have caused small outbreaks within the confines of aircraft, buses and trains.<xref rid="bib58" ref-type="bibr">58</xref>, <xref rid="bib59" ref-type="bibr">59</xref>, <xref rid="bib60" ref-type="bibr">60</xref>, <xref rid="bib61" ref-type="bibr">61</xref> Given the very low transmission potential of H5N1 viruses, travellers can be assured that travel by air etc is safe.</p></sec><sec id="sec9"><title>Evaluation of a traveller with suspected avian influenza</title><p id="para0330">Evaluation of the returned traveller with a fever is the bread and butter of all travel medicine doctors. General practitioners should also be aware of serious illnesses in recently returned travellers and should refer patients quickly for evaluation. There are several reviews on fever in the returned traveller.<xref rid="bib62" ref-type="bibr">62</xref>, <xref rid="bib63" ref-type="bibr">63</xref></p><p id="para0335">Because the risk of H5N1 in travellers is extremely low and its early clinical manifestations can mimic other febrile illnesses like the ‘flu’, malaria, dengue and enteric fever; thinking of H5N1 requires a high index of suspicion. An awareness of the case definitions of avian influenza (<xref rid="tbox2" ref-type="boxed-text">Box 2</xref>) may be helpful to guide the taking of a good history, especially regarding potential exposure (<ext-link ext-link-type="uri" xlink:href="http://www.who.int/csr/disease/avian_influenza/guidelines/casedefinition2006_08_29/en/%2Chttp%3A//www.cdc.gov/flu/avian/professional/guidance-labtesting.htm">http://www.who.int/csr/disease/avian_influenza/guidelines/casedefinition2006_08_29/en/,http://www.cdc.gov/flu/avian/professional/guidance-labtesting.htm</ext-link>).<boxed-text id="tbox2"><label>Box 2</label><caption><title>The WHO definition of a suspected and probable case of H5N1.</title></caption><p id="para0090"><italic>Suspected H5N1 case</italic></p><p id="para0095">A person presenting with unexplained acute lower respiratory illness with fever (>38 °C) and cough, shortness of breath or difficulty breathing AND One or more of the following exposures in the 7 days prior to symptom onset:<list list-type="simple" id="list0020"><list-item id="list-item0085"><label>a.</label><p id="para0100">Close contact (within 1 m) with a person (e.g. caring for, speaking with, or touching) who is a suspected, probable, or confirmed H5N1 case.</p></list-item><list-item id="list-item0090"><label>b.</label><p id="para0105">Exposure (e.g. handling, slaughtering, defeathering, butchering, preparation for consumption) to poultry or wild birds or their remains or to environments contaminated by their faeces in an area where H5N1 infections in animals or humans have been suspected or confirmed in the last month.</p></list-item><list-item id="list-item0095"><label>c.</label><p id="para0110">Consumption of raw or undercooked poultry products in an area where H5N1 infections in animals or humans have been suspected or confirmed in the last month.</p></list-item><list-item id="list-item0100"><label>d.</label><p id="para0115">Close contact with a confirmed H5N1 infected animal other than poultry or wild birds (e.g. cat or pig).</p></list-item><list-item id="list-item0105"><label>e.</label><p id="para0120">Handling samples (animal or human) suspected of containing H5N1 virus in a laboratory or other setting.</p></list-item></list></p><p id="para0125"><italic>Probable H5N1 case (notify WHO)</italic><list list-type="simple" id="list0025"><list-item id="list-item0110"><p id="para0130">Probable definition 1:</p><p id="para0135">A person meeting the criteria for a suspected case AND one of the following additional criteria:<list list-type="simple" id="list0030"><list-item id="list-item0115"><label>a.</label><p id="para0140">infiltrates or evidence of an acute pneumonia on chest radiograph plus evidence of respiratory failure (hypoxemia, severe tachypnoea) OR</p></list-item><list-item id="list-item0120"><label>b.</label><p id="para0145">positive laboratory confirmation of an influenza A infection but insufficient laboratory evidence for H5N1 infection.</p></list-item></list></p></list-item><list-item id="list-item0125"><p id="para0150">Probable definition 2:</p><p id="para0155">A person dying of an unexplained acute respiratory illness who is considered to be epidemiologically linked by time, place, and exposure to a probable or confirmed H5N1 case.</p></list-item></list></p></boxed-text></p><p id="para0340">For patients who present with a predominantly respiratory illness, other respiratory pathogens may be thought of before H5N1 e.g. influenza A/H1N1 or H3N2, pneumococcal, legionella and mycoplasma pneumonia. Lung involvement also characterizes a number of systemic tropical infections, notably, falciparum and vivax malaria, severe typhoid fever, leptospirosis, typhus and melioidosis.<xref rid="bib64" ref-type="bibr">64</xref>, <xref rid="bib65" ref-type="bibr">65</xref>, <xref rid="bib66" ref-type="bibr">66</xref>, <xref rid="bib67" ref-type="bibr">67</xref>, <xref rid="bib68" ref-type="bibr">68</xref> It is also important to consider the existence of coinfections in travellers even if they may present with an apparently clear cut clinical illness.</p><p id="para0345">Many other febrile illnesses will share the laboratory features of H5N1 e.g. low total white cell count, thrombocytopenia, mildly raised PT, aPTT, raised liver enzymes and mild renal impairment. Blood eosinophilia, however, would make H5N1 unlikely.</p><p id="para0350">Experience to date with returned travellers is limited. In one report of 59 travellers with suspected avian influenza, all were H5N1 negative but 25 were positive for seasonal influenza. In an era of heightened awareness of H5N1, many returning travellers who are tested are likely to be H5N1 negative.<xref rid="bib69" ref-type="bibr"><sup>69</sup></xref></p></sec><sec id="sec10"><title>Diagnostics</title><p id="para0355">Faced with a number of possible diagnoses, choosing appropriate diagnostic tests is essential. Aside from the routine diagnostic tests ordered for febrile travellers, obtaining good quality, respiratory specimens is crucial. All specimens should be considered high risk, labelled ‘Biohazardous’ and transported to the laboratory, according to guidelines for infected specimens.</p><p id="para0360">For patients who are well, a nasopharyngeal (NP) sample by either aspiration (NPA) or using an NP swab is the sample of choice and should be obtained observing all the necessary infection control measures. A fresh specimen is preferred but if laboratory processing is not possible immediately, the sample may be stored in a fridge at 4 °C for up to 24 h.</p><p id="para0365">Throat and nose swabs should also be taken on admission and daily thereafter to document clearance of virus. For ventilated patients, an endotracheal aspirate should be obtained. Limited experience from SE Asia shows that an endotracheal aspirate has a higher yield than an NPA which in turn is better than a throat and nasal swab (H. Wertheim, unpublished observations).</p><p id="para0370">Currently available, rapid commercial tests are designed primarily for human A and B influenza and have low sensitivity and specificity for H5N1 and should not be relied upon to diagnose H5N1. A number of user friendly, nucleic acid based, rapid tests are in development for the detection of H5N1 and should be available in the future.<xref rid="bib70" ref-type="bibr"><sup>70</sup></xref> These will need independent evaluation by reference laboratories.<xref rid="bib71" ref-type="bibr"><sup>71</sup></xref></p><p id="para0375">At present, the best way to diagnose H5N1 is by reverse transcriptase polymerase chain reaction (RT PCR) on a respiratory specimen. RT PCR will tell the physician the type of influenza virus i.e. A, B or C and its H and N subtype e.g. H5N1, H3N2, H1N1, H7N7 etc. The result may take 8–12 h. Not all laboratories can do viral subtyping and will only report e.g. influenza A, subtype unknown. Full virus characterisation will then need to be done in a reference laboratory. A real time RT PCR method is also available to measure the viral load.</p><p id="para0380">H5N1 is a systemic disease that has been detected in plasma, pleural fluid, rectal swabs and CSF.<xref rid="bib30" ref-type="bibr">30</xref>, <xref rid="bib36" ref-type="bibr">36</xref>, <xref rid="bib42" ref-type="bibr">42</xref>, <xref rid="bib72" ref-type="bibr">72</xref> Therefore, samples should not be restricted to the respiratory tract.</p><p id="para0385">NPAs, swabs and plasma and, if applicable, post mortem biopsies, are valuable specimens and should be stored. Failure to detect H5N1 may mean another respiratory illness that may be diagnosed with the stored specimens.</p><p id="para0390">Serology on paired serum samples can diagnose retrospectively H5N1. Detecting antibodies by haemagglutination inhibition (HI) and neutralisation are the two principal methods. The latter is more sensitive, detecting antibodies some 14 days post infection but is more labour intensive than HI and requires the use of a BSL-3 laboratory.<xref rid="bib1" ref-type="bibr"><sup>1</sup></xref></p></sec><sec id="sec11"><title>Antiviral resistance and clades</title><p id="para0395">The H5N1 family of viruses is composed of a number of clades (strains).<xref rid="bib35" ref-type="bibr"><sup>35</sup></xref> Evidence to date suggests that different clades have similar clinical pictures.<xref rid="bib23" ref-type="bibr">23</xref>, <xref rid="bib73" ref-type="bibr">73</xref> Of therapeutic importance is their varying <italic>in vitro</italic> sensitivity to the currently available antiviral drugs (<xref rid="tbl1" ref-type="table">Table 1</xref>). Clade 1 H5N1 is intrinsically more sensitive than the clade 2 H5N1 to oseltamivir. The experience from seasonal influenza viruses is that sensitive viruses may mutate and develop reduced sensitivity to the neuraminidase inhibitors, oseltamivir, zanamivir and peramivir and the adamantanes, amantadine and rimantadine.<xref rid="bib74" ref-type="bibr">74</xref>, <xref rid="bib75" ref-type="bibr">75</xref>, <xref rid="bib76" ref-type="bibr">76</xref>, <xref rid="bib77" ref-type="bibr">77</xref>, <xref rid="bib78" ref-type="bibr">78</xref><table-wrap position="float" id="tbl1"><label>Table 1</label><caption><p>Summary of the <italic>in vitro</italic> sensitivity of different H5N1 clades.<xref rid="tblfn1" ref-type="table-fn">a</xref> The IC50 is the concentration of drug that inhibits viral growth by 50%.</p></caption><table frame="hsides" rules="groups"><thead><tr><th></th><th>Oseltamivir carboxylate</th><th>Zanamivir</th><th>Amantadine</th></tr></thead><tbody><tr><td>Clade 1: China, SE Asia</td><td>0.5–2.9</td><td>1.2–1.9</td><td>95%</td></tr><tr><td>Clade 2.1: Indonesia</td><td>11.5</td><td>1.4</td><td>80%</td></tr><tr><td>Clade 2.2: China, SE Asia,Middle East, Europe, Africa</td><td>10.8</td><td>1.4</td><td>No data</td></tr><tr><td>Clade 2.3.4: China, SE Asia</td><td>2.5–3.8</td><td>1.2–1.3</td><td>0%</td></tr></tbody></table><table-wrap-foot><fn id="tblfn1"><label>a</label><p>IC50 units are reported in nmol/L. To convert nmol/L to ng/mL, the units used for reporting oseltamivir carboxylate concentrations, divided by 3.6.</p></fn></table-wrap-foot><attrib>Data have been adapted from Le et al.,<xref rid="bib73" ref-type="bibr"><sup>73</sup></xref> Hurt et al.,<xref rid="bib74" ref-type="bibr"><sup>74</sup></xref> McKimm-Bresckin et al.,<xref rid="bib75" ref-type="bibr"><sup>75</sup></xref> and Govorkova et al.<xref rid="bib107" ref-type="bibr"><sup>107</sup></xref></attrib></table-wrap></p><p id="para0400">A notable example is the recent and rapid emergence globally of seasonal, non ‘swine’, influenza A/H1N1 with reduced sensitivity to oseltamivir due to the H274Y mutation but in the absence of oseltamivir use in communities. The H274Y mutation confers about a marked increase in the IC<sub>50</sub> against oseltamivir and peramivir for both seasonal and avian influenza. The reported increase varies widely from 200 to over 1000 fold.<xref rid="bib74" ref-type="bibr">74</xref>, <xref rid="bib75" ref-type="bibr">75</xref>, <xref rid="bib79" ref-type="bibr">79</xref>, <xref rid="bib80" ref-type="bibr">80</xref>, <xref rid="bib81" ref-type="bibr">81</xref> The majority of H5N1 viruses remain sensitive to oseltamivir but oseltamivir resistant H5N1 has emerged during oseltamivir treatment in H5N1 infected patients who were treated with 75 mg 12 hourly; the virus was found to have the H274Y mutation.<xref rid="bib72" ref-type="bibr"><sup>72</sup></xref></p><p id="para0405">Monitoring of <italic>in vitro</italic> sensitivity of influenza viruses by National Reference Laboratories within the Global Neuraminidase Inhibitor Susceptibility Network is an important surveillance activity and a source of up to date information.<xref rid="bib82" ref-type="bibr">82</xref>, <xref rid="bib83" ref-type="bibr">83</xref></p></sec><sec id="sec12"><title>Treatment</title><p id="para0410">The number of registered antiviral drugs is limited to oral amantadine, rimantadine, oseltamivir and inhaled zanamivir. Intravenous zanamivir is being developed but is available for compassionate use on a named patient basis. IV peramivir has been filed for registration in Japan and has been authorised for use in the USA by the US Food and Drug Administration (FDA) for pandemic H1N1. The neuraminidase inhibitors inhibit viral neuraminidase from breaking the bond between newly formed virions and the sialic acid receptor on the epithelial cell surfaces, thus, preventing their release. The adamantanes inhibit the ion channel function of the M2 matrix protein which results in failure of the virus to uncoat after infecting a cell.</p><p id="para0415">The current mainstay of treatment for avian influenza is oral oseltamivir alone. Recent retrospective data suggest oseltamivir may reduce the mortality of H5N1 by half compared to untreated patients (Interscience Conference on Antimicrobial Agents and Chemotherapy (ICAAC) 2009. Abstract V-533, 9/13/2009). There is no published experience on the use of antiviral combinations in humans but animal data suggest oseltamivir plus ribavirin and amantadine plus oseltamivir are synergistic but, for the latter, only with amantadine sensitive H5N1 virus. These animal studies may pave the way for trials in humans.<xref rid="bib84" ref-type="bibr">84</xref>, <xref rid="bib85" ref-type="bibr">85</xref></p><p id="para0420">The optimal doses of antiviral drugs in H5N1 or other forms of severe influenza have not been evaluated rigorously in randomised trials. Given the rarity of H5N1, such trials may never be conducted. One ongoing study is evaluating double versus standard dose oseltamivir in the treatment of H5N1 and severe seasonal influenza in Vietnam, Indonesia and Thailand under the auspices of the SEA Infectious Diseases Clinical research Network (<ext-link ext-link-type="uri" xlink:href="http://www.seaicrn.org">www.seaicrn.org</ext-link>).</p><p id="para0425">Recommended doses of antivirals are based on mild human influenza but the WHO recommends that physicians consider a double dose of oseltamivir in severely ill patients.<xref rid="bib86" ref-type="bibr"><sup>86</sup></xref> However, this is already common practice for H5N1 and for severe ‘swine’ H1N1 in countries like Vietnam and Indonesia. The somewhat cautious approach of the WHO seems unwarranted. Proper dose ranging studies are needed to determine the optimal dose of oseltamivir alone or in combination. Amantadine or rimantadine at the same doses used for human influenza can be added if the infecting clade is known to be sensitive e.g. the clade 2.3.4 in northern Vietnam and some 2.1 clades.<xref rid="bib73" ref-type="bibr"><sup>73</sup></xref> The adamantanes have a narrower therapeutic index than oseltamivir (which is very well tolerated), thus limiting the possibility of increasing their doses. Using combinations may reduce the probability of the development of resistance on treatment.<xref rid="bib87" ref-type="bibr"><sup>87</sup></xref></p><sec id="sec12.1"><title>Oseltamivir</title><p id="para0430">Oseltamivir phosphate, the parent drug, is well absorbed in patients with mild influenza. This short half life (∼2 h) prodrug lacks antiviral activity and is metabolised to the antivirally active oseltamivir carboxylate (OC). It is given 12 hourly. The uncertainty surrounding the absorption of oseltamivir in severely ill, influenza patients has been partly resolved. In a small clinical series, oseltamivir was well absorbed and achieved higher, steady state plasma concentrations compared to mild influenza patients because of renal impairment and a lower volume of distribution (W. Taylor, unpublished data).<xref rid="bib88" ref-type="bibr"><sup>88</sup></xref></p><p id="para0435">Based on very small numbers of patients to date, viral clearance in throat swabs has occurred within 5 days of oseltamivir treatment<xref rid="bib30" ref-type="bibr">30</xref>, <xref rid="bib72" ref-type="bibr">72</xref>, <xref rid="bib88" ref-type="bibr">88</xref>; whether this is representative of the lungs is unknown. Continuing H5N1 viral replication despite oseltamivir has been documented and is associated with death.<xref rid="bib72" ref-type="bibr"><sup>72</sup></xref> Given the high mortality of H5N1, even double dose oseltamivir alone fails clearly to reverse the pathology in many patients who may have also documented viral clearance. The optimal oseltamivir dose in severe influenza remains to be determined.</p><p id="para0440">Because OC is renally excreted by glomerular filtration and secretion by the human anion 1 transporter in the proximal tubules, the manufacturer recommends that the dose of oseltamivir should be halved in renal disease (CrCl 10–<30 mL/min).<xref rid="bib89" ref-type="bibr"><sup>89</sup></xref> OC loss via a haemofilter during haemofiltration is low and a top up dose is not required.<xref rid="bib88" ref-type="bibr"><sup>88</sup></xref> The reverse is true for haemodialysis (HD) where about two thirds of the OC concentration is lost after a 4 h HD session, so top up doses should be given after dialysis (W. Taylor, unpublished data).<xref rid="bib90" ref-type="bibr"><sup>90</sup></xref> The optimal oseltamivir dose in H5N1 patients with renal impairment is unknown.</p><p id="para0445">Oseltamivir is usually well tolerated; dose related side effects are generally confined to headache, nausea and vomiting despite doses of up to 500 mg given 12 hourly. In post marketing surveillance, a number of severe adverse events have been observed like Stevens Johnson syndrome, cardiac arrhythmias but these reports are often difficult to ascribe to the drug. Given the severity and poor prognosis of H5N1, physicians should not be overly concerned with OC induced toxicity in patients, many of whom will be ventilated.</p></sec><sec id="sec12.2"><title>Amantadine and rimantadine</title><p id="para0450">The roles of amantadine and rimantadine are limited because of the presence of the M2 gene mutation in many H5N1 isolates that confers adamantane resistance. In human influenza, the development of clinical resistance on treatment is well described and this is likely to occur in H5N1 if the adamantanes are used alone.<xref rid="bib91" ref-type="bibr">91</xref>, <xref rid="bib92" ref-type="bibr">92</xref>, <xref rid="bib93" ref-type="bibr">93</xref> Therefore, amantadine and rimantadine should always be used in combination with another antiviral drug. Rimantadine has fewer central nervous system toxicity (e.g. hyperexcitability, slurred speech, tremors, insomnia, dizziness, psychosis, convulsions) than amantadine and is preferred.<xref rid="bib94" ref-type="bibr">94</xref>, <xref rid="bib95" ref-type="bibr">95</xref> These side effects are related to the crossing of the blood brain barrier and are worse with higher plasma concentrations consequent to impaired renal function.<xref rid="bib96" ref-type="bibr">96</xref>, <xref rid="bib97" ref-type="bibr">97</xref> Therefore, dose reduction is required in renal disease.<xref rid="bib98" ref-type="bibr"><sup>98</sup></xref> There is no PK interaction between oseltamivir and amantadine and tolerability was similar to the drugs when given individually in human normal volunteers.<xref rid="bib99" ref-type="bibr"><sup>99</sup></xref></p><p id="para0455">Amantadine crosses the placenta and is associated with toxicity in animal studies. It has also been associated rarely with teratogenic lesions in infants born to mothers with first trimester exposure.<xref rid="bib100" ref-type="bibr">100</xref>, <xref rid="bib101" ref-type="bibr">101</xref> There are no published data for rimantadine. Both should be avoided in pregnancy.</p></sec><sec id="sec12.3"><title>Adjunct treatment</title><p id="para0460">The majority of H5N1 patients in hospital series have developed the acute respiratory distress syndrome, impairment of other organs and required intensive care and mechanical ventilation. The optimal ventilatory settings are unknown but the ARDS Network guidelines of lung protective ventilation is recommended pending more research data.<xref rid="bib102" ref-type="bibr"><sup>102</sup></xref></p><p id="para0465">Based on uncontrolled observational data, high dose, supplementary corticosteroids are not recommended by the WHO because their use in H5N1 patients may be associated with an increase in mortality.<xref rid="bib27" ref-type="bibr">27</xref>, <xref rid="bib35" ref-type="bibr">35</xref> However, steroids may have been given to patients with more severe disease.</p><p id="para0470">Where evidence is lacking in severely ill H5N1 patients, and much of it is, clinicians can apply principles and recommendations formulated from treating patients with e.g. severe sepsis.<xref rid="bib103" ref-type="bibr"><sup>103</sup></xref></p><p id="para0475">There has been very limited but apparently favourable experience with intravenous immunoglobulin<xref rid="bib30" ref-type="bibr"><sup>30</sup></xref> and the administration of serum to Chinese patients with H5N1 from patients who have recovered from H5N1,<xref rid="bib28" ref-type="bibr"><sup>28</sup></xref> as was done also during the 1918 flu pandemic.<xref rid="bib104" ref-type="bibr"><sup>104</sup></xref> Several groups are developing neutralising monoclonal antibodies for use in passive immunization.<xref rid="bib105" ref-type="bibr"><sup>105</sup></xref> Immunomodulatory therapy should be explored as a therapeutic option in combination with antiviral drugs.</p></sec><sec id="sec12.4"><title>Other measures</title><p id="para0480">Avian influenza is a dangerous disease and all suspected cases should be immediately reported to local public health authorities. Confirmed cases should be reported to WHO. Although the risk of person-to-person transmission has been low to date, it is not zero and the case fatality rate is extremely high.<xref rid="bib52" ref-type="bibr">52</xref>, <xref rid="bib106" ref-type="bibr">106</xref> Therefore, patients admitted with suspected avian influenza should be considered infectious and appropriate infection control measures instituted under the guidance of an infection control expert. These should include patient isolation, preferably in a negative pressure room, restriction of visitors, full respiratory and droplet protection for health staff caring for the patient i.e. gloves, goggles, respirators (e.g. N95), and gowns. Secondary cases have occurred in family members who have cared for confirmed cases. Therefore, health surveillance and post-exposure oseltamivir prophylaxis of close contacts of confirmed cases should be considered.</p></sec></sec><sec id="sec13"><title>Concluding remarks</title><p id="para0485">We are learning more about H5N1 infections with the passage of time and research. Early H5N1 infection may be deceptively mild and may not be thought of in the differential diagnosis. Mortality remains high despite the use of antiviral drugs. Pretravel consultations should include advice on H5N1 prevention. The travel doctor is likely to see patients with suspected H5N1 as part of his or her work. Therefore, H5N1 needs to be on the differential diagnosis along with a number of respiratory or systemic fevers. Early diagnosis is key and obtaining the necessary respiratory specimens for RT PCR is essential.</p></sec><sec id="sec14"><title>Conflict of interest statement</title><p id="para0490">No conflict of interest for any author.</p></sec></body><back><ref-list id="bibliography0005"><title>References</title><ref id="bib1"><label>1</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Peiris</surname><given-names>J.S.</given-names></name><name><surname>de Jong</surname><given-names>M.D.</given-names></name><name><surname>Guan</surname><given-names>Y.</given-names></name></person-group><article-title>Avian influenza virus (H5N1): a threat to human health</article-title><source>Clin Microbiol Rev</source><volume>20</volume><issue>2</issue><year>2007</year><fpage>243</fpage><lpage>267</lpage><pub-id pub-id-type="pmid">17428885</pub-id></element-citation></ref><ref id="bib2"><label>2</label><element-citation publication-type="journal"><article-title>Legionnaire's disease</article-title><source>Lancet</source><volume>1</volume><issue>8025</issue><year>1977</year><fpage>1295</fpage><lpage>1296</lpage></element-citation></ref><ref id="bib3"><label>3</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Parashar</surname><given-names>U.D.</given-names></name><name><surname>Anderson</surname><given-names>L.J.</given-names></name></person-group><article-title>Severe acute respiratory syndrome: review and lessons of the 2003 outbreak</article-title><source>Int J Epidemiol</source><volume>33</volume><issue>4</issue><year>2004</year><fpage>628</fpage><lpage>634</lpage><pub-id pub-id-type="pmid">15155694</pub-id></element-citation></ref><ref id="bib4"><label>4</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Duchin</surname><given-names>J.S.</given-names></name><name><surname>Koster</surname><given-names>F.T.</given-names></name><name><surname>Peters</surname><given-names>C.J.</given-names></name><name><surname>Simpson</surname><given-names>G.L.</given-names></name><name><surname>Tempest</surname><given-names>B.</given-names></name><name><surname>Zaki</surname><given-names>S.R.</given-names></name></person-group><article-title>Hantavirus pulmonary syndrome: a clinical description of 17 patients with a newly recognized disease. 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