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- Gonococcal urethritis:5-20%
- Non-gonococcal urethritis:
- Chlamydia trachomatis (CT): the most frequent cause of urethritis in men accounting for 23%-55% of cases. However, the proportion of non-gonococcal urethritis (NGU) cases due to CT is declining gradually.
- Mycoplasma genitalium: maybe the second most frequent cause of urethritis in the U.S and U.K. May account for between 15%-22% of cases of acute NGU. Also has a role in chronic NGU.
- Trichomonas vaginalis: is the cause of only about 2% of cases of acute NGU but probably a higher proportion of chronic NGU.
- Ureaplasma urealyticum: biovar 2 is probably a more important cause of acute NGU than previously realized. Note that organism can be cultured from 30-40% of asymptomatic men. Quantification of the organism may help establish a diagnosis (Frolund Sex Transm Infect 2011).
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