title: Studies on parainfluenza virus pneumonia in children. 1. Factors in the determination of hemagglutination--inhibition antibody against parainfluenza viruses.
mesh_terms: D000293:Adolescent; D000906:Antibodies / Q000032:analysis; D000941:Antigens; D002648:Child; D002675:Child, Preschool; D003470:Culture Media; D006385:Hemagglutination Inhibition Tests; D006386:Hemagglutination Tests; D006801:Humans; D008722:Methods; D018184:Paramyxoviridae Infections / Q000175:diagnosis*; D011024:Pneumonia, Viral / Q000175:diagnosis*; D018108:Respirovirus / Q000276:immunology; D014465:Ultrasonics; D014776:Virus Cultivation
chemical_list: D000906:Antibodies; D000941:Antigens; D003470:Culture Media