UNAIDS–Lancet Commission, London, 25 June 2015 - Countries most affected by HIV must focus on stopping new HIV infections and expanding access to antiretroviral treatment or risk the epidemic rebounding, urges a major new report from the UNAIDS and Lancet Commission. After more than a decade of major achievements, the AIDS response is at a crucial juncture, both in terms of its immediate trajectory and its sustainability, as well as its place in the new global health and development agendas.