These organisms include Chlamydia trachomatis (causes lymphogranuloma venereum [rare], about 50% of nongonococcal urethritis cases, and most cases of mucopurulent cervicitis) Mycoplasma genitalium and M hominis (which causes urogenital infections in women but not men) Trichomonas vaginalis (trichomoniasis) The imprecise term "nonspecific urethritis" can be used, but only if tests for chlamydiae and gonococci are negative and no other pathogen is identified.