Influenza A/swine.
D000328:Adult; D000368:Aged; D002648:Child; D004196:Disease Outbreaks / Q000453:epidemiology / Q000517:prevention & control*; D006801:Humans; D007251:Influenza, Human / Q000453:epidemiology / Q000517:prevention & control*; D014481:United States; D014611:Vaccination