Influenza A virus subtype H1N1, also known as A(H1N1), is a subtype of influenzavirus A and the most common cause of influenza (flu) in humans.

• 型流感病毒亚型H1N1病毒，也称为A（H1N1病毒），是一种亚型流感病毒A和最常见的流行性感冒（流感）在人类。