Trichomoniasis (also known as “trich”) is a very common sexually transmitted infection caused by a parasite (a single-celled protozoan organism) called Trichomonas vaginalis.

The US Centers for Diseases Control (CDC) estimates that about 3.7million people in the US have this infection.
Both men and women can be infected with trichomoniasis, although it is more common amongst women.
Only 1/3 of infected individuals actually develop symptoms and asymptomatic individuals can still transmit the infection to their sexual partners.

https://www.dtapclinic.com/articles/trichomoniasis-in-men-and-women-sexually-transmitted-infection/