[Epidemiological phenomenon and antigenic study of influenza B].
D000293:Adolescent; D000956:Antigens, Viral / Q000032:analysis*; D002648:Child; D006801:Humans; D007251:Influenza, Human / Q000453:epidemiology*; D007564:Japan; D009975:Orthomyxoviridae / Q000276:immunology*
D000956:Antigens, Viral