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Journal of Virology, November 2000, p. 10807-10810, Vol. 74, No. 22
Influenza Branch, Division of Viral and
Rickettsial Diseases, National Center for Infectious Diseases,
Centers for Disease Control and Prevention, Atlanta, Georgia 30333
Received 12 June 2000/Accepted 23 August 2000
Highly pathogenic avian influenza A H5N1 viruses caused an outbreak
of human respiratory illness in Hong Kong. Of 15 human H5N1 isolates
characterized, nine displayed a high-, five a low-, and one an
intermediate-pathogenicity phenotype in the BALB/c mouse model.
Sequence analysis determined that five specific amino acids in four
proteins correlated with pathogenicity in mice. Alone or in
combination, these specific residues are the likely determinants of
virulence of human H5N1 influenza viruses in this model.
0022-538X/00/$04.00+0
Molecular Correlates of Influenza A H5N1 Virus Pathogenesis
in Mice

*
Corresponding author. Mailing address: Influenza
Branch, Mailstop G-16, Centers for Disease Control and Prevention, 1600 Clifton Road, Atlanta, GA 30333. Phone: (404) 639-3591. Fax: (404)
639-2334. E-mail: JKatz{at}cdc.gov.
Present address: USDA/ARS/Southeast Poultry Research Laboratories,
Athens, Ga.
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