Hello! Thanks for query. Trichomonas vaginalis is a parasitic microorganism which is the causative agent of trichomoniasis. Trichomoniasis, a sexually transmitted infection of the urogenital tract, is a common cause of vaginitis in women, while men with this infection can display symptoms of urethritis. Frothy , greenish vaginal discharge with a musty malodorous smell is characteristic. Infection is treated and cured with metronidazole or tinidazole. Medication should be prescribed to both sexual partners. Hope this answers your query. Thank you.