posted on Jul, 4 2008 @ 05:22 AM
"Throughout the history of the AIDS epidemic, a few lucky people have avoided infection despite being exposed again and again. Now, researchers are
traveling back in evolutionary time to understand why some people are resistant -- and in some cases virtually immune -- to the AIDS virus."
"Genetic resistance to AIDS works in different ways and appears in different ethnic groups. The most powerful form of resistance, caused by a genetic
defect, is limited to people with European or Central Asian heritage. An estimated 1 percent of people descended from Northern Europeans are virtually
immune to AIDS infection, with Swedes the most likely to be protected. One theory suggests that the mutation
developed in Scandinavia and moved
southward with Viking raiders. "
"To be protected, people must inherit the genes from both parents; those who inherit a mutated gene from just one parent will end up with greater
resistance against HIV than other people, but they won't be immune. An estimated 10 percent to 15 percent
of those descended from
Northern Europeans have the lesser protection."