AI virus genes have been thought to be the principal gene reservoir and the cause of changes of human influenza virus.
A型禽流感病毒历来被认为是人类流感的最大基因库，是人流感病毒发生变异的新基因来源。
Avian Influenza is an acute and highly contacting infectious disease, especially for poultry to easily infect, which is caused by type AI virus.
流感是由A型流感病毒引起的急性高度接触性传染病，特别是鸡对禽流感有较高的易感性。
Recent years, there has been prevalence of subtype H9 of AI virus in some regions of China, which caused decrease in egg production and serious economic loss to the poultry industry.
近几年，我国部分地区也发现了H9亚型禽流感的流行，引起鸡群生产性能的下降，损失严重。
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