The ANRS COV1-COHVAC project relies on a long-term follow-up of the cohort (at least 7 years after the end of the vaccine trial), that includes the retrospective and prospective collection of medical and biological data [severe health events (grade 3-4), as well as neurological, ophtalmological, and immunological events (any grade), starting from the first injection of a candidate vaccine, are recorded], blood specimen collections and psycho-behavioral evaluations (self-questionnaires and interviews) in order to collect data about consequences of participation and experience of possible HIV vaccine-induced seropositivity in such trials.