Trichomonas parasites. Computer artwork of the parasitic protozoa Trichomonas vaginalis. These single-celled organisms have flagella (thread like appendages) that they move in a whip-like fashion to propel themselves. T. vaginalis infects the urogenital tract of both men and women. In men infection is symptomless, but in women it causes vaginitis, the inflammation of the vagina with a foul discharge.
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