[Seroepidemiological studies of influenza in 1973].
D000293:Adolescent; D000914:Antibodies, Viral / Q000032:analysis*; D002648:Child; D006801:Humans; D007251:Influenza, Human / Q000453:epidemiology / Q000276:immunology*; D007564:Japan
D000914:Antibodies, Viral