Avian influenza(AI) is an infection disease by type A influenza virus, and it is classified Ginfection disease by O.I.E. It is great economic loss in poultry industry. The great characteristics of the highly pathogenic avian influenza is high mortality, the rate of death was 100%.In HongKong,H5Nl subtype of avian influenza virus(AIV) was isolated from 18 human and H9N2 subtype of avian influenza virus was isolated from 2 human directly, which was the first time that AIV overacrossed interspecies barrier and...
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