The Center for Global Health Policy’s “Science Speaks” blog features a series of blog posts on issues discussed at the AIDS Vaccine 2013 conference that recently concluded in Barcelona. The blog includes a post discussing the need to include married or cohabitating couples in HIV prevention trials; a post discussing next steps after a 2009 clinical trial in Thailand showed the risk of HIV infection could be reduced by a vaccine; and a post discussing “questions lingering over the results of three halted clinical research trials for which follow-up studies continue” (Barton, October 2013).