Rating is available when the video has been rented.
This feature is not available right now. Please try again later.
Published on Jul 19, 2012
Some 25,000 scientists, political leaders, and advocates are expected to gather in Washington, D.C., next week for the world's largest AIDS meeting. Gwen Ifill talks with UNAIDS' Michel Sidibe about the successes and continuing challenges to treat and prevent HIV and AIDS.