Background People who inject drugs (PWID) are frequently incarcerated, which is associated with multiple negative health outcomes. Aim We aimed to estimate the associations between a history of incarceration and prevalence of HIV and HCV infection among PWID in Europe. Methods Aggregate data from PWID recruited in drug services (excluding prison services) or elsewhere in the community were reported by 17 of 30 countries (16 per virus) collaborating in a European drug monitoring system (2006–2020; n = 52,368 HIV+/−; n = 47,268 HCV+/−). Country-specific odds ratios (OR) and prevalence ratios (PR) were calculated from country totals of HIV and HCV antibody status and self-reported life-time incarceration history, and pooled using meta-analyses. Country-specific and overall population attributable risk (PAR) were estimated using pooled PR. Results Univariable HIV OR ranged between 0.73 and 6.37 (median: 2.1; pooled OR: 1.92; 95% CI: 1.52–2.42). Pooled PR was 1.66 (95% CI 1.38–1.98), giving a PAR of 25.8% (95% CI 16.7–34.0). Univariable anti-HCV OR ranged between 1.06 and 5.04 (median: 2.70; pooled OR: 2.51; 95% CI: 2.17–2.91). Pooled PR was 1.42 (95% CI: 1.28–1.58) and PAR 16.7% (95% CI: 11.8–21.7). Subgroup analyses showed differences in the OR for HCV by geographical region, with lower estimates in southern Europe. Conclusion In univariable analysis, a history of incarceration was associated with positive HIV and HCV serostatus among PWID in Europe. Applying the precautionary principle would suggest finding alternatives to incarceration of PWID and strengthening health and social services in prison and after release (‘throughcare’).

Book www.wctoh.orgDisclaimer: This supplement has been created within the context of a memorandum of understanding between "EUEP European Publishing" and "The Union". Responsibility for the scientific content of the supplement is allocated to the Scientific Committee of the WCTOH. All authors are responsible for the content of their abstracts and retain copyright of their abstract under an Open Access, Creative Commons License (CC-BY-4.0). Each abstract is citable and identifiable through its individual Digital Object Identifier (DOI).

Contributions: AJS coordinated the study and the EMIS-2010 network, performed the statistical analyses, and wrote the manuscript. MR conceptualized the analysis and the Internalized Homonegativity scale and contributed to the manuscript. RCB contributed to the manuscript and supervised the implementation of IH into the EMIS questionnaire.