Association of spatial proximity to fixed-site syringe services programs with HCV serostatus and injection equipment sharing practices among people who inject drugs in rural New England, United States

Abstract

Abstract Background Hepatitis C virus (HCV) disproportionately affects rural communities, where health services are geographically dispersed. It remains unknown whether proximity to a syringe services program (SSP) is associated with HCV infection among rural people who inject drugs (PWID). Methods Data are from a cross-sectional sample of adults who reported injecting drugs in the past 30 days recruited from rural counties in New Hampshire, Vermont, and Massachusetts (2018–2019). We calculated the road network distance between each participant’s address and the nearest fixed-site SSP, categorized as ≤ 1 mile, 1–3 miles, 3–10 miles, and > 10 miles. Staff performed HCV antibody tests and a survey assessed past 30-day injection equipment sharing practices: borrowing used syringes, borrowing other used injection equipment, and backloading. Mixed effects modified Poisson regression estimated prevalence ratios (aPR) and 95% confidence intervals (95% CI). Analyses were also stratified by means of transportation. Results Among 330 PWID, 25% lived ≤ 1 mile of the nearest SSP, 17% lived 1–3 miles of an SSP, 12% lived 3–10 miles of an SSP, and 46% lived > 10 miles from an SSP. In multivariable models, compared to PWID who lived within 1 mile of an SSP, those who lived 3 to 10 miles away had a higher prevalence of HCV seropositivity (aPR: 1.25, 95% CI 1.06–1.46), borrowing other used injection equipment (aPR: 1.23, 95% CI 1.04–1.46), and backloading (aPR: 1.48, 95% CI 1.17–1.88). Similar results were observed for PWID living > 10 miles from an SSP: aPR [HCV]: 1.19, 95% CI 1.01–1.40; aPR [borrowing other used equipment]:1.45, 95% CI 1.29–1.63; and aPR [backloading]: 1.59, 95% CI 1.13–2.24. Associations between living 1 to 3 miles of an SSP and each outcome did not reach statistical significance. When stratified by means of transportation, associations between distance to SSP and each outcome (except borrowing other used injection equipment) were only observed among PWID who traveled by other means (versus traveled by automobile). Conclusions Among PWID in rural New England, living farther from a fixed-site SSP was associated with a higher prevalence of HCV seropositivity, borrowing other used injection equipment, and backloading, reinforcing the need to increase SSP accessibility in rural areas. Means of transportation may modify this relationship.

Keywords

• Rural
• Syringe services programs
• Hepatitis C virus
• Spatial proximity
• Spatial analysis
• Injection drug use