Swine influenza: frequently asked questions.
D000818:Animals; D004196:Disease Outbreaks; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype; D007251:Influenza, Human / Q000453:epidemiology* / Q000209:etiology / Q000821:virology; D009976:Orthomyxoviridae Infections / Q000453:epidemiology; D013552:Swine / Q000821:virology; D013553:Swine Diseases / Q000453:epidemiology