Trichomonas vaginalis associated with nongonococcal urethritis and prostatitis.

Trichomonas vaginalis was recovered from three (1.7%) of 179 men with nongonococcal urethritis. Prostatitis was found in 11 (8%) of 138 of these men who had prostatic examinations; T. vaginalis was recovered from two of the 11. Serologic evidence (an indirect hemagglutination titer of greater than or equal to 1:80) was found in 20 (14%) of 146 men; four of the 20 had prostatitis and two of these had prostatitis associated with T. vaginalis. In a group of 26 men with urethritis and prostatitis associated with T. vaginalis, the typical clinical presentation was persistent urethritis and/or prostatitis due to an antibiotic-resistant agent.