Trichomonas Infections: Infections in birds and mammals produced by various species of Trichomonas.Trichomonas vaginalis: A species of TRICHOMONAS that produces a refractory vaginal discharge in females, as well as bladder and urethral infections in males.Trichomonas Vaginitis: Inflammation of the vagina, marked by a purulent discharge. This disease is caused by the protozoan TRICHOMONAS VAGINALIS.Trichomonas: A genus of parasitic flagellate EUKARYOTES distinguished by the presence of four anterior flagella, an undulating membrane, and a trailing flagellum.Antitrichomonal Agents: Agents used to treat trichomonas infections.Vagina: The genital canal in the female, extending from the UTERUS to the VULVA. (Stedman, 25th ed)Metronidazole: A nitroimidazole used to treat AMEBIASIS; VAGINITIS; TRICHOMONAS INFECTIONS; GIARDIASIS; ANAEROBIC BACTERIA; and TREPONEMAL INFECTIONS. It has also been proposed as a radiation sensitizer for hypoxic cells. According to the Fourth Annual Report on Carcinogens (NTP 85-002, 1985, p133), this substance may reasonably be anticipated to be a carcinogen (Merck, 11th ed).Tritrichomonas foetus: A species of flagellate parasitic EUKARYOTE. It possesses a long undulating membrane that is bordered on its outer margin by a flagellum that becomes free posteriorly. This organism causes infections in cows that could lead to temporary infertility or abortion.Parasitology: The study of parasites and PARASITIC DISEASES.Vaginal Discharge: A common gynecologic disorder characterized by an abnormal, nonbloody discharge from the genital tract.Leukorrhea: A clear or white discharge from the VAGINA, consisting mainly of MUCUS.Pyruvate Synthase: A ferredoxin-containing enzyme that catalyzes the COENZYME A-dependent oxidative decarboxylation of PYRUVATE to acetyl-COENZYME A and CARBON DIOXIDE.Sexually Transmitted Diseases: Diseases due to or propagated by sexual contact.Vaginosis, Bacterial: Polymicrobial, nonspecific vaginitis associated with positive cultures of Gardnerella vaginalis and other anaerobic organisms and a decrease in lactobacilli. It remains unclear whether the initial pathogenic event is caused by the growth of anaerobes or a primary decrease in lactobacilli.Vaginitis: Inflammation of the vagina characterized by pain and a purulent discharge.