National Center for HIV/AIDS, Viral Hepatitis, STD and TB Prevention
Division of Sexually Transmitted Diseases
Program and Training Branch
Trichomoniasis, caused by Trichomonas vaginalis, is the one of the most common treatable STDs in American women. It is estimated that
three million cases occur annually in the United States. In women, infection with T. vaginalis has been suggested to be associated with adverse pregnancy outcomes, including premature rupture of membranes and pre-term labor, pelvic inflammatory disease, and increased risk for HIV infection.
Approximately 3% prevalence in the general female population.
1.3% in non-Hispanic white women
1.8% in Mexican American women
13.3% in non-Hispanic black women
Prevalence increases with age among non-Hispanic black women
50%-60% prevalence in female prison inmates and commercial sex workers.
18%-50% prevalence in females with vaginal complaints.
85% of women are asymptomatic.
Not routinely tested in men. A 17% prevalence rate was seen in males attending an STD clinic in one city.
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Risk factors associated with trichomoniasis include: