What is trichomoniasis?

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 a sexually transmitted infection (STI) caused by the motile parasitic protozoan Trichomonas vaginalis. It is one of the most common STIs, both in the United States and worldwide. [1, 2]

The high prevalence of T vaginalis infection globally and the frequency of coinfection with other STIs make trichomoniasis a compelling public health concern. Research has shown that T vaginalis infection is associated with an increased risk of infection with several STIs, including gonorrhea, human papillomavirus (HPV), herpes simplex virus (HSV), and, most importantly, HIV. [1, 3, 4, 5] Trichomoniasis is also associated with adverse pregnancy outcomes, infertility, postoperative infections, and cervical neoplasia. [6]

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