TABLE 1.
Total Early Syphilis Cases Among San Francisco MSM, 1996 to 2016
| 1996–1999 |
2000–2004 |
2005–2009 |
2010–2016 |
|
|---|---|---|---|---|
| Total Early Syphilis Cases | 101 | 1694 | 2129 | 6069 |
| Stage, n (%) | ||||
| Primary | 20 (19.8) | 386 (22.8) | 440 (20.7) | 1249 (20.6) |
| Secondary | 58 (57.4) | 735 (43.4) | 835 (39.2) | 1745 (28.8) |
| Early latent | 23 (22.8) | 573 (33.8) | 854 (40.1) | 3075 (50.7) |
| Age | ||||
| Mean (median), y | 35.8 (35.0) | 38.0 (38.0) | 40.0 (40.0) | 40.6 (41.0) |
| Range, y | 19–58 | 16–77 | 17–79 | 15–78 |
| Proportion ages 25 y and under, % | 10.9 | 4.9 | 6.8 | 7.8 |
| Race, % | ||||
| White | 51.5 | 63.1 | 62.0 | 58.5 |
| African American/Black | 15.8 | 7.9 | 9.0 | 8.7 |
| Hispanic | 22.8 | 19.0 | 18.1 | 21.8 |
| Other | 9.9 | 10.0 | 10.9 | 11.0 |
| Diagnosing provider, % | ||||
| SF City Clinic | 45.5 | 33.2 | 25.9 | 20.4 |
| Magnet | — | 3.0 | 10.2 | 19.0 |
| Private clinics/hospitals | 40.6 | 48.4 | 49.6 | 43.6 |
| Other | 13.9 | 15.4 | 14.3 | 17.0 |
| Syphilis history, % | ||||
| Previously reported with at least one early syphilis diagnosis | 7.9 | 15.6 | 30.5 | 41.2 |
| Previously reported with at least one early syphilis diagnosis (3 y) | 6.9 | 12.7 | 19.4 | 26.8 |
| Previously reported with at least one diagnosis of primary or secondary syphilis (past 3 y) | 5.0 | 8.6 | 11.0 | 14.3 |
| Reported sexual and risk behaviors | ||||
| Mean no. male partners in the CP | — | 13.5 | 10.4 | 11.1 |
| Proportion of total CP partners who cases named | — | 62.9 | 49.5 | 31.7 |
| Proportion of total CP partners who cases refused to name | — | 20.2 | 39.6 | 32.0 |
| Proportion of total CP partners who were unidentifiable | — | 16.9 | 10.9 | 36.3 |
| Proportion of cases who reported any named partners who were not SF residents | — | 11.1 | 12.4 | 15.7 |
| Use of methamphetamine in past year, % | — | 11.4 | 19.4 | 26.6 |
| Disease investigation, % | ||||
| Proportion of total cases assigned for Partner Services | 100 | 98.1 | 86.2 | 66.3 |
| Proportion of assigned cases who refused Partner Services | 1.0 | 5.8 | 8.3 | 5.4 |
| Interview rate among assigned cases* | 49.5 | 86.9 | 79.0 | 84.0 |
| Treatment rate among assigned partners† | — | 54.5 | 33.4 | 51.6 |
| Disease intervention rate‡ | — | 30.5 | 18.8 | 18.0 |
*
Interview rate: proportion of total early syphilis cases assigned for Partner Services that were interviewed.
†
Treatment rate: proportion of named partners assigned for follow-up that were treated as a case of syphilis or prophylactically treated, divided by the total number of named partners assigned for follow-up.
‡
Disease intervention rate: proportion of total early syphilis cases with at least one named partner who was treated as a result of Partner Services. CP indicates critical period; MSM, men who have sex with men.