Despite substantial progress made in expanding access to HIV/AIDS treatment and prevention options, a vaccine for HIV—even an imperfect one—is likely needed to put a durable end to the epidemic. In this episode of Take as Directed, Dr. Mark Feinberg, President and CEO of the International AIDS Vaccine Initiative (IAVI) discusses the landscape of HIV vaccine development and why he thinks a vaccine remains a necessary pursuit. Dr. Feinberg also discusses the facilitating role that IAVI plays in the HIV vaccine development process. Hosted by Sara Allinder. Produced by Alex Bush. Edited by Ribka Gemilangsari.