The 9th IAS Conference on HIV Science (IAS 2017) on 23-26 July 2017 at the Palais des Congrès in Paris, France. This biennial gathering is the largest open scientific conference on HIV and AIDS related issues – bringing together a broad cross-section of more than 6,000 professionals from around the world to meet and examine the latest scientific developments in HIV-related research with a focus on moving science into practice and policy.