Individual and contextual factors involved in the transmission of HIV and the Hepatitis C virus (HCV) among injection drug users (IDUs), with a view to identifying strategies for preventing new infections. These studies are conducted by monitoring a prospective IDU cohort seronegative for HIV and/or HCV. This cohort is linked to a geographic information system that makes it possible to study environmental and individual factors gathered during biannual meetings with participants.

Access to health care by drug addicts, in particular the evaluation of the impact of treatments for recent HCV infection among drug users on drug consumption and quality of life.

Several ongoing collaborations with researchers in epidemiology, clinical research and basic research in Quebec, Canada and abroad.