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Trichomoniasis ("trich") is a sexually transmitted infection (STI). It is very common. According to the Centers for Disease Control and Prevention (CDC), 3.7 million Americans are infected with trichomoniasis at any given time. Trich is easily treated.
When symptoms do occur, they often begin five to 28 days after a person is infected. Although for some people it can take much longer.
The most common symptoms among women are:
The most common symptoms in men are:
Trich is caused by a one-celled protozoan organism called Trichomonas vaginalis. It travels from person to person through genital contact during sex.
In women, the organism causes an infection in the vagina, urethra, or both. In men, the infection only happens in the urethra. Once the infection begins, it can easily be spread through unprotected genital contact.
Trich is not spread through normal physical contact such as hugging, kissing, sharing dishes, or sitting on a toilet seat. In addition, it can’t be spread through sexual contact that doesn’t involve the genitals.
One million new cases of trich are estimated each year, according to the American Sexual Health Association and the CDC. Trichomoniasis is more common in women than in men, and 2.3 million women with the infection are between the ages of 14 and 49. It’s more common among older women than younger women. One study showed that women over 40 are twice as likely to be infected as previously suggested.
Your risk of infection can increase due to having:
Trich symptoms are similar to those of other STIs. It can’t be diagnosed by symptoms alone. See your doctor for a physical exam and laboratory tests if you think that you might have an infection.
A number of tests can diagnose trich, including:
Make sure your sexual partners are properly tested and take the medication, too. Not having any symptoms doesn’t mean they don’t have the infection. You will need to avoid sexual contact for a week after all partners have been treated.
Without treatment, a trich infection can be ongoing. With treatment, trichomoniasis is usually cured within a week.
You can contract trich again after treatment if your partner was not treated or if a new partner has the infection. Reduce your chances of having the infection again by making sure all of your sexual partners get treatment. Then, wait for the infection to clear before becoming sexually active again. It is recommended that you wait one week after taking your medication before having sex again.
Your symptoms should go away after a week. If your symptoms continue longer, talk to your doctor about getting retested and retreated.
See your doctor for a follow-up test for trich at least three months after your treatment. The reinfection rate for women can be as high as 17 percent in the three months after treatment. Reinfection is possible even if your partners were treated as well. There are cases of trich being resistant to certain medications.
Some tests can be conducted as soon as two weeks after your treatment. Because of a lack of data supporting rescreening for men, they are generally not retested.
A trich infection can make it easier to contract other STIs. Genital inflammation caused by trichomoniasis can increase your risk of getting HIV, along with other STIs. It also becomes easier for you to spread the virus to someone else when you have trich.
Trich can cause unique complications in pregnant women. There can be a higher chance of delivering prematurely or delivering a baby with low birth weight. Although rare, the infection can be transmitted to the baby during delivery.
One study suggested that your child’s risk of developing an intellectual disability increases if you have trich during pregnancy.
It’s safe to take the medications metronidazole and tinidazole during pregnancy. No adverse effects have been noted.
If you are pregnant and suspect that you have trich or any other STI, talk to your doctor as soon as possible to prevent complications for you and your child.
You can only fully prevent trich by abstaining from all sexual activity.
Use latex condoms during sexual intercourse to reduce your chances of contracting trich and other STIs.
Written by: Lauren Reed-Guy and Tim Jewell
Medically reviewed on: Aug 31, 2016: Judith Marcin, MD
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