XVII International AIDS Conference in Mexico City. Closing session with speeches by the Co-chairs Pedro Cahn and Luiz Enrique Soto-Ramírez., as well as the Mayor of Mexico City and the Co-Chairs of the next International AIDS Conference in Vienna in, 2010.

Helene Gayle is an AIDS expert who has been working in many different initiatives in the US, among them the Centers for Disease Control (CDC). She also works in President Obama's advisory group on HIV/AIDS. Here she talks about understanding and changing behaviors.