Characterization of a highly pathogenic avian influenza H5N1 virus sublineage in poultry seized at ports of entry into Vietnam

Nguyen, Tung
Davis, C. Todd
Stembridge, William
Shu, Bo
Balish, Amanda
Inui, Kenjiro
Do, Hoa T.
Ngo, Huong T.
Wan, Xiu-Feng
McCarron, Margaret
Lindstrom, Stephen E.
Cox, Nancy J.
Nguyen, Cam V.
Klimov, Alexander I.
Donis, Ruben O.

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Publication date

May 2009

DOI

10.1016/j.virol.2009.03.006

ISSN

0042-6822

Citation count (estimate)

Abstract

AbstractHighly pathogenic avian influenza H5N1 virus was detected in poultry seized at two ports of entry located in Lang Son Province, Vietnam. Sequence analysis of the hemagglutinin (HA) genes from five H5N1 virus isolates and ten PCR amplicons from chicken cloacal samples revealed their close phylogenetic relationship to clade 7 H5N1 HA genes. However, these HA genes exhibited extensive genetic divergence at both the nucleotide and amino acid levels in comparison to previously described clade 7 viruses; e.g., A/chicken/Shanxi/2/2006. In addition, hemagglutination inhibition tests revealed antigenic differences between these and previously isolated H5N1 viruses from Vietnam. These results indicate that viruses with clade 7 HA are evolving...