XVIII International AIDS Conference in Vienna in 2010. Peter Piot, Seth Berkley, José Esparza, Helene Gayle and Alan Bernstein talk about HIV vaccine development strategies.

Cutaways of a session at the XVI International AIDS Conference in Toronto in August, 2006. Canadian Social Democratic politician Stephen Lewis is speaking.

XVI International AIDS Conference in Toronto in August, 2006. Closing session with music performance and presentations of the Mexican representatives of the International AIDS Society. They speak about the 2008 International AIDS Conference in Mexico.

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.