title: Complement fixation to pleuropneumonia-like organism and cold hemagglutination titers in children with primary atypical pneumonia.
mesh_terms: D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D003168:Complement Fixation Tests; D006386:Hemagglutination Tests; D006801:Humans; D009174:Mycoplasma / Q000276:immunology*; D009175:Mycoplasma Infections / Q000276:immunology*; D011014:Pneumonia / Q000276:immunology*