This systematic review examined the characteristics of community-based HIV prevention interventions, specifically the theoretical underpinning, type and number of components, dose, mode of delivery, and teaching method; and explored the effects of the intervention characteristics on HIV-related knowledge and engagement in risk behaviour among young persons between the ages of 15 and 24 years of age residing in Africa. A total of 5 studies were included in this review. The overall results of this study showed variability in theoretical underpinning, dose, and mode of delivery of interventions....