Table 2.
Rates of new syphilis among HIV-positive MSM in the OCS compared to males in Ontario
| HIV-positive MSM, OHTN Cohort Study (OCS) | Ontario males (a) | |||||
|---|---|---|---|---|---|---|
| Year | Rate of first diagnosis per 100PY (95 % CI) | Rate of re-diagnosis per 100PY (95 % CI) (b) | Rate of any new diagnosis per 100PY (95 % CI) | Percent change from preceding year | Rate of new infectious syphilis case per 100PY | Percent change from preceding year |
| 2006 | 1.2 (0.6, 2.5) | 4.0 (1.9, 8.4) | 1.8 (1.1, 3.0) | --- | 0.0055 | --- |
| 2007 | 1.7 (1.1, 2.7) | 3.2 (1.8, 5.8) | 2.1 (1.5, 2.9) | 13.2 | 0.0061 | 10.9 |
| 2008 | 1.4 (0.9, 2.1) | 6.7 (4.6, 9.8) | 2.6 (1.9, 3.4) | 24.3 | 0.0065 | 6.6 |
| 2009 | 3.3 (2.5, 4.4) | 9.0 (6.6, 12.3) | 4.7 (3.8, 5.8) | 82.8 | 0.0107 | 64.6 |
| 2010 | 2.0 (1.4, 2.9) | 10.9 (8.3, 14.4) | 4.3 (3.5, 5.4) | −7.9 | 0.0112 | 4.7 |
PY Person-years, CI Confidence interval
(a) Population-based rates of reported infectious syphilis among males in Ontario, Canada. Source: [20]
(b) Re-diagnosis defined as an observable four-fold rise in RPR titre. See text for details