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- Commonly implicated:
- Chlamydia trachomatis (CT) : 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: may be 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.
- Neisseria gonorrhoeae: as a cause of urethritis, gonorrhea is increasingly a geographically isolated infection in the US. It persists in inner-city populations, in particular.
- 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. In 1999 the organism was divided into 2 species: U. parnumparnum (Biovar 1) and U. urealyticum (Biovar 2). Studies suggest only the latter associated with urethritis.
- Less common: include
- Herpes simplex virus (rare in absence of obvious skin lesions)
- Haemophilus spp
- Yeasts, e.g., Candida spp.
- N. meningitidis
- Staphylococcus saprophyticus.
- Novel bacteria recently associated with bacterial vaginosis such as Leptotrichia/Sneathia spp. may be the urethral pathogens of "idiopathic" NGU.