性活跃妇女的阴道中经常分离出尿素分解支原体(U.U.)。一生中有3个或更多的性侣的无症状妇女中,75%以上阴道中有 U.U.。性活跃男性也经常带有 U.U.,大多数病例无症状。但是,U.U.是一些男性的非淋菌性尿道炎(NGU)的重要原因。因为四环素和红霉素在体外有抗 U.U.的功效;在 Ureaplasma urealyticum (U.U.) is frequently isolated in the vagina of sexually active women. Of the asymptomatic women with three or more sexual partners in their lifetime, more than 75% of the vagina have U.U. Sexually active men often carry U.U., most cases are asymptomatic. However, U.U. is an important cause of nongonococcal urethritis (NGU) in some men. Because tetracycline and erythromycin have anti-U.U. efficacy in vitro;