[Etiological and serological investigation on an influenza epidemic simultaneously caused by 2 types of virus at Shijiazhuang City in 1977].
D000293:Adolescent; D000328:Adult; D000914:Antibodies, Viral / Q000032:analysis; D002648:Child; D002675:Child, Preschool; D002681:China; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D009980:Influenza A virus / Q000276:immunology / Q000302:isolation & purification*; D007251:Influenza, Human / Q000209:etiology*; D008875:Middle Aged; D013997:Time Factors
D000914:Antibodies, Viral