Table 1

Estimated risk of having Chlamydia trachomatis and/or Mycoplasma genitalium in high risk young men with and without urethritis (Gram-stained urethral smear with or without first passed urine Gram-stained thread¹⁷), and their partners, depending on clinical findings

Clinical findings of index male attending Department of Genitourinary Medicine			Risk of C trachomatis and/or M genitalium
Discharge* and/or dysuria	Penile irritation	Urethritis	Index male	Partner(s)†
*Either as a symptom or clinical sign.
†High, 40–50%; moderate, 15–25%; low, <10%. Assumes that the partner of a man with urethritis who has tested positive for C trachomatis and/or M genitalium has a 66% risk of also testing positive,^5,^29,³⁰ and the partner of a man who has tested negative has a 5–25% risk.^4–^6,^8,²⁸
‡Exact risk difficult to quantify because of variation in definition of “asymptomatic” in clinical studies; see text.
Yes	+/−	Yes	45–55%^5,^9,¹⁰	High†^5,⁶
No	Yes	Yes	15–25%‡^1,^7,^13,²⁰	Moderate†
No	No	Yes	10–20%‡^1,^2,^5,^7,^8,^16,²⁸	Moderate to low†^4–^6,^8,²⁸
Yes	+/−	No	10%^1,^5,⁷	Unknown
No	Yes	No	<10%	Low
No	No	No	3%^1,^5,^7,¹⁶	Low