Genetic Immunity or Susceptibility to AIDS

From a comment at Steve Sailer's blog:

Researchers with the VA found last summer a gene in most blacks linked to a protective mutation against malaria (the same one that can lead to sickle-cell anemia) that makes HIV infection following exposure significantly more likely. Europeans also had the Black Death and a host of other pandemics fostered by our history as pastoral, agricultural and urban peoples. (The "germs" in Jared Diamond's "Guns, Germs and Steel") Immunities arising from those are a part of our genetic heritage. 10-15% of whites in Europe and North America have been found to have a gene that confers a strong resistance to HIV infection, for example.