title: Circulating immune complexes in patients with mycoplasmal pneumonia.
abstract: Circulating immune complexes as measured by conglutinin (IgG-IC) and IgM rheumatoid factor (IgM-RF) were studied in 114 patients with mycoplasmal pneumonia (58 inpatients and 56 outpatients). The levels of IgG-IC and IgM-RF of the patients were significantly higher than those of 13 healthy control subjects. In addition, the levels of IgG-IC of the inpatients were significantly higher than those of the outpatients. The highest titers of IgG-IC were obtained 9 to 30 days after onset of disease, and the levels of IgG-IC were elevated during the time period when pulmonary changes were pronounced. The levels of IgM-RF were irrelevant to infiltration on chest radiographs. An analysis using density gradient centrifugation showed that the decrease of IgG-IC with intermediate size was associated with improvement of the disease. A possible pathogenic role of IgG-IC in mycoplasmal pneumonia is discussed.
mesh_terms: D000293:Adolescent; D000328:Adult; D000936:Antigen-Antibody Complex / Q000032:analysis / Q000276:immunology*; D002499:Centrifugation, Density Gradient; D002648:Child; D002675:Child, Preschool; D037222:Collectins; D004797:Enzyme-Linked Immunosorbent Assay; D006801:Humans; D007075:Immunoglobulin M / Q000032:analysis; D007223:Infant; D008970:Molecular Weight; D011019:Pneumonia, Mycoplasma / Q000276:immunology*; D012217:Rheumatoid Factor / Q000032:analysis; D012712:Serum Globulins; D013045:Species Specificity
chemical_list: D000936:Antigen-Antibody Complex; D037222:Collectins; D007075:Immunoglobulin M; D012712:Serum Globulins; C024014:conglutinin; D012217:Rheumatoid Factor