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 MedicineRisk of C trachomatis and/or M genitalium
Discharge* and/or dysuriaPenile irritationUrethritisIndex malePartner(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.
NoNoYes10–20%‡1,2,5,7,8,16,28Moderate to low†4–6,8,28