Population-Level Outcomes of Partner Notification Among Gay, Bisexual, and Other Men Who Report Sex With Men Diagnosed With Infectious Syphilis in British Columbia, Canada.

Background: Syphilis testing, treatment, and partner notification (PN) are centrally coordinated in British Columbia (BC), Canada. Public health (PH) nurses (PHNs) contact almost all syphilis patients and either notify partners of syphilis exposure (PH-initiated PN) or support patients to notify their own partners (patient-initiated PN). In the context of an ongoing syphilis epidemic among gay, bisexual, and other men who report sex with men (gbMSM), we measured population-level yields and compared PN approaches to inform prevention and control efforts.

Methods: All gbMSM diagnosed with infectious syphilis in 2016 in BC were included. We calculated indicators of engagement with PN among patients and PN outcomes among notifiable partners using a cascade-of-care framework. χ2 Tests compared indicators between PN approaches.

Results: Of the 759 syphilis diagnoses, 85.4% (648/759) were among gbMSM and 94.7% (614/648) were treated within 30 days of testing (mean [SD], 5.5 [5.2] days). Among patients, 87.7% (568/648) discussed PN with PHNs and 49.5% (281/568) named at least 1 notifiable partner, for a total of 1094 partners (mean [SD], 3.9 [5.5] partners/patient). Compared with PH-initiated PN, patient-initiated PN resulted in a greater proportion of partners notified (70.1% [573/817] vs. 89.8% [211/235]; P = 1.88 × 10-9), but there was no difference in the proportion of partners tested and/or treated (90.2% [517/573] vs. 86.7% [183/211]; P = 0.203), and diagnosed (12.8% [66/517] vs. 16.4% [30/183]; P > 0.271).

Conclusions: Public health- and patient-initiated PN had similarly high yields of partners tested and/or treated, and diagnosed, demonstrating that gbMSM can contribute to syphilis PN when supported by resource-equipped PHNs.