title: Securing opioid substitution treatment access and quality for people who inject drugs
abstract: In this issue of AIDS, Nosyk et al.[1] present significant results about the causal effect of opioid substitution treatment (OST) on adherence to antiretroviral treatment (ART). Their study included a large database of 1852 HIV-infected, opioid-dependent individuals in British Columbia (Canada) and used a complex and consistent methodology to show the causal link between receiving OST and ART adherence. Their findings showed that individuals receiving OST are 70% more likely to be ART-adherent. 
journal: AIDS