TRICHOMONIASIS
Trichomonas vaginalis is a sexually transmitted disease (STD), although transmission by other routes (such as soiled towels) has been documented. There is no cyst in the life cycle, so transmission is via the trophozoite stage. Most people infected with trichomoniasis are asymptomatic. Symptomatic infections are characterized by a white discharge from the genital tract and itching.
Diagnosis depends on finding trophozoites in secretions of the genital tract from men or women. In cases where the numbers of organisms are very low, the trophozoites can be cultured to increase their numbers (see below).
Cause: Trichomonas vaginalis, a motile protozoan
Symptoms: discharge, vaginal irritation, painful intercourse, occasionally odor or itching
Complications: probably none
Treatment: metronidazole, an prescription antibiotic
Prevention: condoms; men who are not circumcised and older men are more likely to be infected