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Journal of Virology, August 2005, p. 9926-9932, Vol. 79, No. 15
0022-538X/05/$08.00+0 doi:10.1128/JVI.79.15.9926-9932.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.
Characterization of a Human H5N1 Influenza A Virus Isolated in 2003
Kyoko Shinya,1,2
Masato Hatta,2
Shinya Yamada,1
Ayato Takada,1
Shinji Watanabe,2
Peter Halfmann,2
Taisuke Horimoto,1
Gabriele Neumann,2
Jin Hyun Kim,2
Wilina Lim,4
Yi Guan,5
Malik Peiris,5
Makoto Kiso,3,6
Takashi Suzuki,3,7,8
Yasuo Suzuki,3,7,8 and
Yoshihiro Kawaoka1,2,3,9*
Division of Virology, Department of Microbiology and Immunology, Institute of Medical Science, University of Tokyo,1
International Research Center for Infectious Diseases, Tokyo 108-8639,9
Department of Biochemistry, School of Pharmaceutical Sciences, University of Shizuoka,7
COE program in the 21st Century, Shizuoka 422-8526,8
CREST, Japan Science and Technology Agency, Saitama 332-0012,3
Department of Applied Bioorganic Chemistry, Gifu University, Gifu 501-1193, Japan,6
Government Virus Unit, Department of Health, Kowloon,4
Department of Microbiology, The University of Hong Kong, Queen Mary Hospital, Pokfulam, Hong Kong SAR, People's Republic of China,5
Department of Pathobiological Sciences, University of WisconsinMadison, Madison, Wisconsin 537062
Received 8 February 2005/
Accepted 27 April 2005
In 2003, H5N1 avian influenza virus infections were diagnosed in two Hong Kong residents who had visited the Fujian province in mainland China, affording us the opportunity to characterize one of the viral isolates, A/Hong Kong/213/03 (HK213; H5N1). In contrast to H5N1 viruses isolated from humans during the 1997 outbreak in Hong Kong, HK213 retained several features of aquatic bird viruses, including the lack of a deletion in the neuraminidase stalk and the absence of additional oligosaccharide chains at the globular head of the hemagglutinin molecule. It demonstrated weak pathogenicity in mice and ferrets but caused lethal infection in chickens. The original isolate failed to produce disease in ducks but became more pathogenic after five passages. Taken together, these findings portray the HK213 isolate as an aquatic avian influenza A virus without the molecular changes associated with the replication of H5N1 avian viruses in land-based poultry such as chickens. This case challenges the view that adaptation to land-based poultry is a prerequisite for the replication of aquatic avian influenza A viruses in humans.
* Corresponding author. Mailing address: Department of Pathobiological Sciences, School of Veterinary Medicine, University of WisconsinMadison, 2015 Linden Drive, Madison, WI 53706. Phone: (608) 265-4925. Fax: (608) 265-5622. E-mail:
kawaokay{at}svm.vetmed.wisc.edu.
Journal of Virology, August 2005, p. 9926-9932, Vol. 79, No. 15
0022-538X/05/$08.00+0 doi:10.1128/JVI.79.15.9926-9932.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.
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