It is reported that a German physician has CURED HIV infection in a patient by performing a bone-marrow transplant from a donor possessing natural immunity. HIV immunity is conferred by a genetic mutation that appears to originate from Northern Europe during the Middle Ages. Individuals with two copies of the mutant gene, one from each parent, have immune cells without CCR5 receptors, which cannot be infected by HIV. Individuals with a single copy of the gene are not immune, but have greater than normal resistance to HIV infection.
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Fantastic!
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I remember, a few years back, a really excellent documentary on PBS about the discovery made between those who did not contract the bubonic plague in England in the 17th century and those who are HIV immune. It was the same thing, I believe, a double set of a certain gene. They called the condition double delta...something.