Number and percentage of symptomatic cases of gonococcal, chlamydial and non-gonococcal, non-chlamydial urethritis (NGNCU) occurring in men who have sex with men (MSM) STD clinic patients by sexual exposures in the prior 60 days
| Presumed anatomical source of infection based on sexual behaviour | Gonorrhoea* | Chlamydia* | NGNCU |
|---|---|---|---|
| Oropharynx | 414 (27.5) | 188 (31.4) | 1053 (35.9) |
| IOS | 129 (8.6) | 54 (9.0) | 441 (15.0) |
| PIAI | 285 (18.9) | 134 (22.4) | 612 (20.9) |
| Rectum (UIAI) | 1088 (72.1) | 406 (67.8) | 1824 (62.2) |
| Vagina | 3 (0.2) | 3 (0.5) | 23 (0.8) |
| None | 4 (0.3) | 2 (0.3) | 35 (1.2) |
*Gonococcal/chlamydial co-infections excluded from this analysis.
IOS, insertive oral sex only; PIAI, protected insertive anal intercourse plus oral sex; UIAI, unprotected insertive anal intercourse.