Do sleep aids really help if you're suffering from a sleep disorder? We asked an expert to find out. First up, our expert tackles melatonin. Dr. Candice Alfano, a sleep expert and clinician at the ...

In Zambia, we met people who are HIV positive, couldn't get drugs to suppress the virus after U.S. aid cuts and were seeing ...

LONDON. Is HIV the only cause of AIDS? How much does it matter when a country is doing the most that it can to stop a massive epidemic? Jasper Morch of UNICEF, Chairman of the UNAIDS Theme Group in ...