what std is caused by a protozoan
Making the world better, one answer at a time. Trichomoniasis is caused by a protozoan. TRICHOMONIASIS. Trichomonas. Trichomonas vaginalis is the protozoa that causes trichomoniasis. Trichomoniasis. Trichomoniasis is a STD caused by a protozoa. Tichomonasis is an infection by a protozoan most commonly spead through sexual intercourse.