Novel Platforms for Delivery and/or Expression of HIV Env Immunogens for HIV Vaccines: Efforts towards the development of an efficacious HIV vaccine have focused on improvements in the design of the HIV envelope (Env) immunogen for induction and generation of broadly neutralizing antibody (bNAb) responses and novel platforms for immunogen delivery. The goal of this program is to develop an HIV vaccine platform for delivery of HIV Env immunogens that induce bnAbs and to demonstrate that the vaccine platform/immunogen proposed will elicit a strong and durable NAb HIV Env response.