Which protozoan causes trichomoniasis?

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sexually transmitted disease Scanning electron micrograph of the spirochete *Treponema pallidum* attached to testicular cell membranes.

Trichomoniasis is caused by the flagellate protozoan Trichomonas vaginalis. This parasite is a common cause of sexually transmitted infection in humans, typically spread through sexual contact. While other species of Trichomonas exist—such as T. hominis and T. buccalis—T. vaginalis is the specific species associated with this condition in the human reproductive system.123