Respiratory syncytial virus and parainfluenza virus surveillance--United States, 1989-90.
D002648:Child; D004196:Disease Outbreaks; D006801:Humans; D007223:Infant; D018184:Paramyxoviridae Infections / Q000453:epidemiology*; D011159:Population Surveillance; D012136:Respiratory Syncytial Viruses; D010253:Respirovirus Infections / Q000453:epidemiology*; D012621:Seasons; D014481:United States / Q000453:epidemiology