title: [Studies on Chlamydia trachomatis as the cause of respiratory infections. I. Prevalence of serum antibodies to Chlamydia trachomatis in healthy adults and patients with respiratory infections].
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000907:Antibodies, Bacterial / Q000032:analysis*; D002690:Chlamydia Infections / Q000276:immunology*; D002692:Chlamydia trachomatis / Q000276:immunology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012141:Respiratory Tract Infections / Q000276:immunology*
chemical_list: D000907:Antibodies, Bacterial