Background: We assess trends in HIV and hepatitis C virus (HCV) risk behaviors and prevalent infection among people who inject drugs (PWID) in New York City (NYC). Methods: PWID in NYC were sampled using respondent-driven sampling in 2005, 2009, and 2012 (serial cross sections) for the Centers for Disease Control and Prevention-sponsored National HIV Behavioral Surveillance study. Participants were interviewed about their current (≤12 months) risk behaviors and tested for HIV and HCV. The crude and adjusted risk ratio (RR) and 95% confidence interval (95% CI) for linear time trends were estimated using generalized estimating equations regression with a modified Poisson model. Results: The sample comprised 500, 514, and 525 participants in 2005, 2009, and 2012, respectively. Significant (P< 0.05) linear trends in risk behaviors included a decline in unsafe syringe sources (60.8%, 31.3%, 46.7%; RR = 0.86, 95% CI: 0.81 to 0.92), an increase in all syringes from syringe exchanges or pharmacies (35.4%, 67.5%, 50.3%; RR = 1.15, 95% CI: 1.09 to 1.22), and an increase in condomless vaginal or anal sex (53.6%, 71.2%, 70.3%; RR = 1.14, 95% CI: 1.09 to 1.19). Receptive syringe sharing (21.4%, 27.0%, 25.1%), sharing drug preparation equipment (45.4%, 43.4%, 46.7%), and having ≥2 sex partners (51.2%, 44.0%, 50.7%) were stable. Although HIV seroprevalence declined (18.1%, 12.5%, 12.2%), HCV seroprevalence was high (68.2%, 75.8%, 67.1%). In multivariate analysis, adjusting for sample characteristics significantly associated with time, linear time trends remained significant, and the decline in HIV seroprevalence gained significance (adjusted RR = 0.76, 95% CI: 0.64 to 0.91, P = 0.003). Conclusions: This trend analysis suggests declining HIV prevalence among NYC PWID. However, HCV seroprevalence was high and risk behaviors were considerable. Longitudinal surveillance of HIV and HCV risk behaviors and infections is needed to monitor trends and for ongoing data-informed prevention among PWID.
BACKGROUND: Men who have sex with men are disproportionately burdened by HIV/AIDS, and the advent of pre-exposure prophylaxis (PrEP) has provided an effective strategy to reduce the risk of HIV transmission. Research has shown that improving one partner's health-promoting behaviors increases the likelihood that their partner adopts healthier behaviors. We examined the longitudinal relationship between favorable HIV treatment outcomes with current PrEP use among HIV serodiscordant male partners. SETTING: Data are from Project Stronger Together, a randomized controlled trial that recruited serodiscordant male couples from Atlanta, GA; Boston, MA; and Chicago, IL. METHODS: Serodiscordant couples completed assessments at baseline, 6, 12, 18, and 24 months. We analyzed longitudinal data from 120 HIV serodiscordant male partners to assess the relationship between the HIV-negative partner's current PrEP use and their HIV-positive partner's current ART use, ART adherence, and viral load using generalized estimating equation models. RESULTS: Fewer than half of the HIV-negative partners were on PrEP at baseline and nearly two-thirds of their HIV-positive partners were virally suppressed. HIV-negative male partners who had partners with an undetectable viral load had greater odds of being a current PrEP user than HIV-negative partners with partners with a detectable viral load. CONCLUSION: Our study highlights the need to develop dyad-level interventions to improve HIV medication use/adherence by HIV serodiscordant male couples. Our findings also suggest that dyad-level interventions may be able to leverage our understanding of how partners can influence each other's health-promoting behaviors to develop programs that improve health outcomes for both partners.