SYMPTOMS: Off color discharge (yellowish, greenish, grayish), irritation, burning sensation

CAUSE: motile protozoan, Trichomonas vaginalis

DIAGNOSIS: Microscopic examination the vaginal discharge or culture

TREATMENT: a single dose of prescription metronidazole, 2 grams (2000 mg) at bedtime

PREVENTION: This vaginal infection can be sexually transmitted so condoms would usually prevent it. If you have this your partner should also be treated. Men often have no symptoms even if they're infected. The chance of a man being a carrier is related to the number of other partners he has and is increased if he is older or uncircumcised.