Quarraisha Abdool Karim is an epidemiologist in Durban. She talks about the start of the South African AIDS epidemic and the South African AIDS response, health policies and campaigns. She explains why women are more susceptible to HIV than men are.

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.

Students are interviewed on the street in Washington DC, about HIV/AIDS and prevention.