title: Serologic studies on the behaviour of influenza virus type A in persons of Greater São Paulo during 1976, 1978 and 1979.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D000914:Antibodies, Viral / Q000032:analysis*; D001938:Brazil; D002648:Child; D002675:Child, Preschool; D006385:Hemagglutination Inhibition Tests; D006801:Humans; D007223:Infant; D009980:Influenza A virus / Q000276:immunology*; D007251:Influenza, Human / Q000453:epidemiology / Q000276:immunology*; D008875:Middle Aged
chemical_list: D000914:Antibodies, Viral