Reinfection with influenza.
D000328:Adult; D000956:Antigens, Viral / Q000235:genetics; D002648:Child; D002675:Child, Preschool; D004196:Disease Outbreaks; D006801:Humans; D007109:Immunity; D007223:Infant; D007251:Influenza, Human / Q000453:epidemiology / Q000276:immunology*; D008297:Male; D009154:Mutation; D009975:Orthomyxoviridae / Q000235:genetics / Q000276:immunology
D000956:Antigens, Viral