Trichomoniasis is a sexually transmitted infection caused by the parasite Trichomonas vaginalis. Trichomoniasis is found worldwide. In the United States, the highest number of cases are seen in women between age 16 and 35. Trichomoniasis is rarely found in men though some guys also infected. This disease is spread through sexual contact with an infected partner. This include penis-to-vagina intercourse or vulva-to-vulva-contact. The parasite cannot survive in the mouth or rectum.
In women it can cause a foul-smelling vaginal discharge, genital itching and painful urination. Men who have trichomoniasis typically have no symptoms. Pregnant women who have trichomoniasis are at higher risk of delivering prematurely.
The most common treatment for trichomoniasis involves taking one megadose of metronidazole (Flagyl). Infection can be prevented by using condoms and spermicide.