Trichomoniasis is an infection with a single-cell parasite. “Trich” is the most common STI found in young, sexually active women. You can get trichomoniasis by having vaginal sex with someone who has it. Infection is more common in women than in men. Older women are more likely than younger women to have been infected.
The parasite is passed from an infected person during vaginal sex (i.e., penis-vagina or vulva-vulva). It does not commonly infect other parts of the body (e.g., hands, anus, mouth).
