[Influenza and parainfluenza virus infections among Peking children. Their etiology and clinical features].
D002648:Child; D002675:Child, Preschool; D002681:China; D004196:Disease Outbreaks; D006801:Humans; D007223:Infant; D007251:Influenza, Human / Q000453:epidemiology / Q000209:etiology; D018184:Paramyxoviridae Infections / Q000453:epidemiology / Q000209:etiology