What is the incidence of trichomoniasis in the US?

Updated: Jan 02, 2020
  • Author: Darvin Scott Smith, MD, MSc, DTM&H; Chief Editor: Michael Stuart Bronze, MD  more...
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Trichomoniasis is one of the most common STIs in the United States, with a prevalence estimated at 8 million cases annually; however, exact numbers are difficult to obtain because the infection is not nationally reportable and many infections are asymptomatic. [26, 27, 28, 29] Prevalence is also thought to be underestimated owing to the low sensitivity of the commonly used wet mount technique.

Research in high-risk populations shows that the prevalence of trichomoniasis varies widely across the United States. In STI clinics, the prevalence of T vaginalis infection ranges from 15%-54%. [16, 30] In 2 samples of female prison inmates, the prevalence was on the higher end of that range, between 31.2% and 46.9%. [31, 32] In US men, trichomoniasis accounts for 10%-21% of urethritis cases not attributable to gonorrheal or chlamydial infection. [30]

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