Trichomoniasis, also called trich, is the most common curable sexually transmitted infection. Dr. Alvarado, what can you tell us about trich?
Well, Dr. Mayzik, trichomoniasis is an infection caused by a parasite, and it affects more women than men. The parasite can spread from penis to vagina, from vagina to penis, or from vagina to vagina during sex. It's uncommon for other body parts, such as the hands, mouth, or anus, to be infected.
Although trich is one of the most common STIs, only about 30 percent of people infected ever experience any symptoms. For this reason, many people may not know they have the parasite.