title: Differences in the therapeutic response of chlamydia-positive and chlamydia-negative forms of nongonococcal urethritis.
mesh_terms: D002689:Chlamydia / Q000187:drug effects*; D002690:Chlamydia Infections / Q000188:drug therapy*; D002986:Clinical Trials as Topic; D004341:Drug Evaluation; D004352:Drug Resistance, Microbial; D006801:Humans; D008297:Male; D010919:Placebos; D012008:Recurrence; D013754:Tetracyclines / Q000494:pharmacology* / Q000627:therapeutic use; D014526:Urethritis / Q000188:drug therapy* / Q000382:microbiology
chemical_list: D010919:Placebos; D013754:Tetracyclines