Influenza. Epidemiology and prevention.
D000368:Aged; D000818:Animals; D000956:Antigens, Viral; D004196:Disease Outbreaks / Q000453:epidemiology* / Q000517:prevention & control; D006801:Humans; D007109:Immunity; D007252:Influenza Vaccines / Q000627:therapeutic use; D007251:Influenza, Human / Q000453:epidemiology* / Q000276:immunology / Q000517:prevention & control; D009975:Orthomyxoviridae / Q000276:immunology
D000956:Antigens, Viral; D007252:Influenza Vaccines