TABLE 2.

Causes of non-gonococcal urethritis (NGU) in men.

Aetiology of NGU	Proportion of cases (%)
Chlamydia trachomatis	20–50%
Mycoplasma genitalium	10–30%
Ureaplasma urealyticum	5–10%
Trichomonas vaginalis (UK)	1–5%
Urinary tract infection	1–5%
Adenovirus	2–4%
Herpes simplex virus	2–3%
Miscellaneous	Less than 5%