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Journal of Virology, October 2000, p. 9372-9380, Vol. 74, No. 20
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
H9N2 Influenza Viruses Possessing H5N1-Like Internal Genomes
Continue To Circulate in Poultry in Southeastern China
Y.
Guan,1,2,
K. F.
Shortridge,2
S.
Krauss,1
P. S.
Chin,2
K. C.
Dyrting,3
T. M.
Ellis,3
R. G.
Webster,1,2,4,* and
M.
Peiris2
Department of Virology and Molecular
Biology1 and Department of
Pathology,4 St. Jude Children's Research
Hospital, Memphis, Tennessee 38105-2794, and Department of
Microbiology, The University of Hong Kong, Queen Mary
Hospital,2 and Department of
Agriculture, Fisheries and Conservation, Castle Peak Veterinary
Laboratory,3 Hong Kong SAR, China
Received 17 May 2000/Accepted 26 July 2000
The transmission of H9N2 influenza viruses to humans and the
realization that the A/Hong Kong/156/97-like (H5N1) (abbreviated HK/156/97) genome complex may be present in H9N2 viruses in
southeastern China necessitated a study of the distribution and
characterization of H9N2 viruses in poultry in the Hong Kong SAR in
1999. Serological studies indicated that H9N2 influenza viruses had
infected a high proportion of chickens and other land-based birds
(pigeon, pheasant, quail, guinea fowl, and chukka) from southeastern
China. Two lineages of H9N2 influenza viruses present in the
live-poultry markets were represented by A/Quail/Hong Kong/G1/97
(Qa/HK/G1/97)-like and A/Duck/Hong Kong/Y280/97 (Dk/HK/Y280/97)-like
viruses. Up to 16% of cages of quail in the poultry markets contained
Qa/HK/G1/97-like viruses, while about 5% of cages of other land-based
birds were infected with Dk/HK/Y280/97-like viruses. No reassortant
between the two H9N2 virus lineages was detected despite their
cocirculation in the poultry markets. Reassortant viruses represented
by A/Chicken/Hong Kong/G9/97 (H9N2) were the major H9N2 influenza
viruses circulating in the Hong Kong markets in 1997 but have not been
detected since the chicken slaughter in 1997. The Qa/HK/G1/97-like
viruses were frequently isolated from quail, while Dk/HK/Y280/97-like
viruses were predominately associated with chickens. The
Qa/HK/G1/97-like viruses were evolving relatively rapidly, especially
in their PB2, HA, NP, and NA genes, suggesting that they are in the
process of adapting to a new host. Experimental studies showed that
both H9N2 lineages were primarily spread by the aerosol route and that neither quail nor chickens showed evidence of disease. The high prevalence of quail infected with Qa/HK/G1/97-like virus that contains
six gene segments genetically highly related to HK/156/97 (H5N1) virus
emphasizes the need for surveillance of mammals including humans.
*
Corresponding author. Mailing address: Department of
Virology and Molecular Biology, St. Jude Children's Research Hospital, 332 North Lauderdale, Memphis, TN 38105-2794. Phone: (901) 495-3400. Fax: (901) 523-2622. E-mail: robert.webster{at}stjude.org.

Present address: Department of Microbiology, The University of Hong
Kong, Queen Mary Hospital, Hong Kong SAR,
China.
Journal of Virology, October 2000, p. 9372-9380, Vol. 74, No. 20
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
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