Gay bowel syndrome: syphilis association.
D003092:Colitis / Q000150:complications*; D006716:Homosexuality; D006801:Humans; D008297:Male; D008795:Metronidazole / Q000627:therapeutic use; D011350:Proctocolitis / Q000150:complications* / Q000188:drug therapy; D013587:Syphilis / Q000150:complications*
D008795:Metronidazole