The 'Berlin Patient,' a U.S. citizen named Timothy Ray Brown, underwent a procedure in which HIV-resistant stem cells from an individual with an unusual genetic profile were introduced into his body. The donor patient's CD4 cells lacked the CCR5 co-receptor -- the most common variety of HIV uses CCR5 co-receptors as a "docking station," attaching to it in order to enter and infect CD4 cells. People with this particular genetic mutation are almost completely protected against infection.[...]
Berlin doctors published his detailed case history in the New England Journal of Medicine in February 2009. Now they've published a follow-up report in the journal Blood, saying: "It is reasonable to conclude that cure of HIV infection has been achieved in this patient."
Link via Glenn Reynolds | Image: NIH