Bacterial sexually transmitted diseases.

Common sexually transmitted bacterial organisms may affect the anorectum and perianal skin. While some of these infections are a result of contiguous spread from genital infection, most result from receptive anal intercourse. Polymicrobial infection is common and there is overlap in symptoms caused by the organisms that may infect the anorectum. This article addresses the most common bacterial organisms that are sexually transmitted and affect the anorectum. It includes discussions of gonorrhea, campylobacter, chlamydia, shigella, chancroid, granuloma inguinale, and syphilis. Incidence, mode of transmission, presenting signs and symptoms, diagnostic modalities, and treatment are reviewed.