Influenza a virus is the major pathogen not only carrying seasonal influenza but also causing flu pandemic in history.
A型流感病毒不但是季节性流感的主要病原，而且历史上几次流感大流行也都由A型流感病毒引起。
Influenza a virus is the major pathogen not only carrying seasonal influenza but also causing flu pandemic in history.
A型流感病毒不但是季节性流感的主要病原，而且历史上几次流感大流行也都由A型流感病毒引起。
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