Urethral inflammation that is not the result of infection with Neisseria gonorrhoeae. Urethral inflammation may be diagnosed by the presence of one of the following criteria:
No evidence of N. gonorrhoeae infection by culture or Gram stain
A clinically compatible case among males in whom gonorrhea is not found, either by culture or Gram stain
Nongonococcal urethritis is a clinical diagnosis of exclusion. The syndrome may result from infection with several agents (see Chlamydia trachomatis, Genital Infection). A clinically compatible case excluding gonorrhea and chlamydia should be classified as NGU. An illness among men that meets the case definition of NGU and C. trachomatis infection should be classified as chlamydia.