female sexual contacts of men with nongonococcal urethritis ( ngu ) are often treated with either tetracycline or erythromycin because these antimicrobial agents are active in vitro against most strains of both chlamydia trachomatis and ureaplasma urealyticum , the major identified causes of ngu .
C0014806
erythromycin
C1136254
antimicrobial