Serological examinations by the CFT with the group-specific ornithosis antigen were carried out with 1910 sera from patients with chronic diseases of the kidneys, urinary tracts and male sexual organs, as well as with 556 control sera from patients with cardio-vascular and other diseases for elucidation of the role of chlamydia (OLT group) in the infectious pathology of the kidneys and urinary tracts of man. No complement-fixing antibody was detected with the group-specific ornithosis antigen in control sera. The antibody was found in 5.2% of sera from patients with chronic diseases of the kidneys and upper urinary tracts and in 6.2% of cases with the involvement of the proximal part of the urinary tracts and male sexual organs. The intradermal test (IDT) with ornithosis allergen was performed for those patients whose sera contained complement-fixing antibody. The results of CFT and IDT coincided in 82.8% of the patients, thus confirming the etiological role of chlamydia in human urogenital pathology. Studies on the positive sera with the species-specific ornithosis antigen gave negative results, indicating that a distinct species of chlamydia is the agent of urogenital diseases.
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