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Characterization of H9N2 influenza A viruses isolated from chicken products imported into Japan from China

Published online by Cambridge University Press:  07 July 2006

M. MASE ,
M. ETO ,
K. IMAI ,
K. TSUKAMOTO  and
S. YAMAGUCHI
M. MASE
Affiliation:
Department of Infectious Diseases, National Institute of Animal Health, Kannondai, Tsukuba, Ibaraki, Japan
M. ETO
Affiliation:
Animal Quarantine Service, Haramachi, Yokohama, Japan
K. IMAI
Affiliation:
Obihiro University of Agriculture and Veterinary Medicine, Inada, Obihiro, Hokkaido, Japan
K. TSUKAMOTO
Affiliation:
Department of Infectious Diseases, National Institute of Animal Health, Kannondai, Tsukuba, Ibaraki, Japan
S. YAMAGUCHI
Affiliation:
Department of Infectious Diseases, National Institute of Animal Health, Kannondai, Tsukuba, Ibaraki, Japan
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Abstract

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We characterized eleven H9N2 influenza A viruses isolated from chicken products imported from China. Genetically they were classified into six distinct genotypes, including five already known genotypes and one novel genotype. This suggested that such multiple genotypes of the H9N2 virus have possibly already become widespread and endemic in China. Two isolates have amino-acid substitutions that confer resistance to amantadine in the M2 region, and this supported the evidence that this mutation might be a result of the wide application of amantadine for avian influenza treatment in China. These findings emphasize the importance of surveillance for avian influenza virus in this region, and of quarantining imported chicken products as potential sources for the introduction of influenza virus.

Type
Research Article
Information
Epidemiology & Infection , Volume 135 , Issue 3 , April 2007 , pp. 386 - 391
Copyright
2006 Cambridge University Press
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