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Clinical Microbiology Reviews, April 2007, p. 243-267, Vol. 20, No. 2
0893-8512/07/$08.00+0     doi:10.1128/CMR.00037-06
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

Avian Influenza Virus (H5N1): a Threat to Human Health

J. S. Malik Peiris,1,2* Menno D. de Jong,3 and Yi Guan1

Department of Microbiology, University Pathology Building, Queen Mary Hospital, The University of Hong Kong, Pokfulam, Hong Kong, SAR, People's Republic of China,1 Hong Kong University—Pasteur Research Centre, Sassoon Rd., Pokfulam, Hong Kong, SAR, People's Republic of China,2 Oxford University Clinical Research Unit, Hospital for Tropical Diseases, 190 Ben Ham Tu, Ho Chi Minh City, Vietnam3

Pandemic influenza virus has its origins in avian influenza viruses. The highly pathogenic avian influenza virus subtype H5N1 is already panzootic in poultry, with attendant economic consequences. It continues to cross species barriers to infect humans and other mammals, often with fatal outcomes. Therefore, H5N1 virus has rightly received attention as a potential pandemic threat. However, it is noted that the pandemics of 1957 and 1968 did not arise from highly pathogenic influenza viruses, and the next pandemic may well arise from a low-pathogenicity virus. The rationale for particular concern about an H5N1 pandemic is not its inevitability but its potential severity. An H5N1 pandemic is an event of low probability but one of high human health impact and poses a predicament for public health. Here, we review the ecology and evolution of highly pathogenic avian influenza H5N1 viruses, assess the pandemic risk, and address aspects of human H5N1 disease in relation to its epidemiology, clinical presentation, pathogenesis, diagnosis, and management.

* Corresponding author. Mailing address: Department of Microbiology, University Pathology Building, Queen Mary Hospital, The University of Hong Kong, Pokfulam, Hong Kong, SAR, People's Republic of China. Phone: (852) 2855-4888. Fax: (852) 2855-1241. E-mail: malik{at}hkucc.hku.hk

Clinical Microbiology Reviews, April 2007, p. 243-267, Vol. 20, No. 2
0893-8512/07/$08.00+0     doi:10.1128/CMR.00037-06
Copyright © 2007, American Society for Microbiology. All Rights Reserved.



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