美国今年发现的最常见的季节性流感病毒是A型流感病毒(H1N1)。

The most common seasonal flu virus found in the United States this year is type a (H1N1).

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猪流感是由A型流感病毒引起的猪呼吸道传染病，病毒的定期爆发会引起猪患病。

It is a contagious respiratory disease of pigs caused by type a influenza viruses. Pigs are hit by regular outbreaks.

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只有A型流感病毒可造成大流行。

Only influenza a viruses can cause pandemics.

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