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Subtype H9N2 avian influenza viruses (AIVs) circulating in China have aroused increasing concerns for their impact on poultry and risk to public health. The present study was an attempt to elucidate the phylogenetic relationship of H9N2 AIVs in two geographically distinct regions of China where vaccination is routinely practiced. A total of 18 emerging H9N2 isolates were identified and genetically...
Avian influenza virus (H9N2) infection is a major problem of product performance in poultry worldwide. Vaccination is used to limit spread, but more knowledge is needed on the epidemiology of virus subtypes to improve vaccine design. In this study, 40 H9N2 subtype avian influenza viruses (AIVs) were isolated from vaccinated poultry flocks in China from 2010 to 2011. Hemagglutinin (HA) from different...
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