Peter Piot, former Executive Director Joint UN programme on HIV-AIDS speaks during opening of AIDS Conference in 2008, Auditorio Nacional, Mexico City. (Photo: Henry Romero/REUTERS)

This year's International AIDS Conference will highlight a sense of optimism among top HIV researchers about stemming the spread of the virus around the globe. Anchor Lisa Mullins talks to Peter Piot, former executive director of UNAIDS, about the new optimism and his career as a virus hunter.

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