2nd person cured of HIV using stem cells

Researchers in the United Kingdom have confirmed that a stem cell transplant has cured a second person of HIV. The donor cells used in a stem cell transplant that cured a second man of HIV were from a patient who had a gene defect (called CCR5delta32 mutant) which results in the absence of one of the critical entry gatekeepers that HIV generally needs in order to infect cells. But the reason both people who have now been cured of HIV...