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Trichomoniasis is a common cause of vaginitis. It is a sexually transmitted infection, and is caused by the single-celled protozoan parasite Trichomonas vaginalis producing mechanical stress on host cells and then ingesting cell fragments after cell death.richomonas vaginalis infection is the most common non-viral STI in the world with an estimated 248 million new cases per year. It is more common in women (2.7%) than males (1.4%). It is also the most common non-viral STI in the U.S., with an estimated 3.7 million prevalent cases and 1.1 million new cases per year.
Having trichomoniasis can make it feel unpleasant to have sex. Without treatment, the infection can last for months or even years. What are the complications of trichomoniasis? Trichomoniasis can increase the risk of getting or spreading other sexually transmitted infections. For example, trichomoniasis can cause genital inflammation that makes it easier to get infected with HIV, or to pass the HIV virus on to a sex partner. How does trichomoniasis affect a pregnant woman and her baby?