Trichomonas vaginalis is an anaerobic, flagellated protozoan parasite and the causative agent of trichomoniasis. It is the most common pathogenic protozoan infection of humans in industrialized countries. Infection rates between men and women are similar with women being symptomatic, while infections in men are usually asymptomatic. Transmission usually occurs via direct, skin-to-skin contact with an infected individual, most often through vaginal intercourse. Usually treatment consists of metronidazole and tinidazole. Patients present with a foul-smelling, greenish discharge; itching and burning; and "strawberry cervix"; vaginal pH will be >4.5.