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Nongonococcal Urethritis
1990 Case Definition
Clinical description
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:
- A visible abnormal urethral discharge (excludes
scant amounts of clear mucus)
- A positive leukocyte esterase test from men
less than 60 years of age without a history of kidney disease
or bladder infection, prostate enlargement, urogenital anatomic
anomaly, or recent urinary tract instrumentation
- Microscopic evidence of urethritis (greater
than or equal to 5 WBC per high-power field) on a Gram stain
of a urethral smear
Laboratory criteria for diagnosis
Case classification
Confirmed: a clinically
compatible case among males in whom gonorrhea is not found, either
by culture or Gram stain
Comment
Nongonococcal urethritis is a clinical diagnosis
of exclusion. The syndrome may result from infection with several
agents (see Chlamydia trachomatis 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.
See also:
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