Background
Hepatitis C virus (HCV) represents a significant cause of morbidity and mortality globally. While sex workers (SWs) may face elevated HCV risks through both drug/sexual pathways, incidence data among SWs are severely lacking. We characterized HCV incidence and predictors of HCV seroconversion among women SWs in Vancouver, BC.
Methods
Questionnaire and serological data were drawn from a community-based cohort of women SWs (2010–2014). Kaplan-Meier methods and Cox regression were used to model HCV incidence and predictors of time to HCV seroconversion.
Results
Among 759 SWs, HCV prevalence was 42.7%. Among 292 baseline-seronegative SWs, HCV incidence density was 3.84/100 person-years(PY), with higher rates among women using injection drugs (23.30/100 PY) and non-injection crack (6.27/100 PY), and those living with HIV (13.27/100 PY) or acute STIs (5.10/100 PY). In Cox analyses adjusted for injection drug use, age (HR: 0.94, 95%CI: 0.86–1.01), acute STI infection (HR: 2.49, 95%CI: 1.02–6.06), and non-injection crack use (HR: 2.71, 95%CI: 1.18–6.25) predicted time to HCV seroconversion.
Discussion
While HCV incidence was highest among women who inject drugs, STIs and non-injection stimulant use appear to be pathways to HCV infections, suggesting potential dual sexual/drug transmission. Integrated HCV services within sexual health and HIV/STI programs are recommended.