This common STD is caused by a single celled protozoan parasite, Trichomonas vaginalis. Most common site of infection in women is the vagina and in men, the urethra. Therefore, infection generally occurs via penile-vaginal intercourse among men and women, or vulva-vulva contact between women.

Signs and Symptoms

Most men do not display symptoms; however some men may experience slight irritation inside the penis, mild discharge, or slight burning following urination or ejaculation.

Between 5 and 28 days following infection, some women may experience frothy, yellow-green vaginal discharge, with a strong odor. Additionally, the infection may cause a slight discomfort during intercourse and urination, and irritation and itching of the genital area. In rare cases, slight abdominal pain may accompany symptoms.

How Common is it?

This infection is classified as the most common curable STD in young sexually active women in the United States. Approximately 7.4 million new cases present each year in men and women.

How Do People Get Trichomoniasis?

Trichomoniasis is caused by the single-celled protozoan parasite, Trichomonas vaginalis. The vagina is the most common site of infection in women, and the urethra (urine canal) is the most common site of infection in men. The parasite is sexually transmitted through penis-to-vagina intercourse or vulva-to-vulva (the genital area outside the vagina) contact with an infected partner. Women can acquire the disease from infected men or women, but men usually contract it only from infected women.

Testing and Treatment

For both men and women, a health care provider must perform a physical examination and laboratory test to diagnose trichomoniasis. The parasite is harder to detect in men than in women. Metronidazole, a prescription drug, is the most common and effective treatment. Testing is available at GW's Student Health Service, please call (202) 994-6827 to set up an appointment.

How do I Protect Myself?

As with all STDs, the most accurate prevention technique is abstaining from sexual contact or be in a mutually monogamous relationship with a sexual partner who has been tested and is known to be uninfected. However, latex male condoms reduce the risk of contraction significantly when used correctly and consistently.

Reference: Information obtained from Center for Disease Control and Prevention