The Center for Global Health Policy’s “Science Speaks” blog discusses a new guide (.pdf) from Pathfinder International that “looks at the web of interacting factors that influence the effectiveness of HIV interventions among sex workers, men who have sex with men, people who use injecting drugs, and other ‘key affected populations.’ It provides examples of activities to strengthen individual and collective abilities to access treatment, prevention measures, and economic strengthening pulled from actions that the organization has employed in work in India, Kenya, Mozambique and Brazil” (Barton, 4/28).