Trichomoniasis, nicknamed "trick," is a sexually transmitted disease (STD) caused by a microscopic one-celled organism called Trichomonas vaginalis. Trichomoniasis can cause vaginal infections in women and inflammation of the urethra (the tube that drains urine from the bladder) in both sexes. In pregnant women, Trichomonas infections also can increase the risk of premature rupture of the membranes and preterm delivery.
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