After more than a decade, doctors think they were finally able to replicate the case of the Berlin patient, the only man known to be cured of HIV. But the London patient offers more questions than answers.

Epidemiologists are thinking about trying to stop the spread of HIV with more HIV, but a strain engineered to be harmless to humans.

Instead of helping Africans combat the spread of AIDS, the Catholic Church keeps pouring gasoline on the fire.