31.3.3  STI caused by a protozoan

Trichomoniasis is a STI caused by a protozoan that is usually found in vaginal and urethral tissues. It presents in women with profuse and frothy vaginal discharge. Although this condition is most often treated in women, men can also be infected but often show no symptoms.

31.3.2  STIs caused by viruses

31.3.4  STI caused by a fungus