[VadeRetro]

Most people still don't have the virus, but if its ancestor had been in Europeans long ago, all people of European descent would have some form of it.

... Or they'd have the immunity, I should have said. Introduced in humans in pre-tech times, the virus would have created a huge death rate until either 1) a milder form of the virus evolved or, 2) humans with the immunity mutation were the most common kind of people around.

We don't all have the mutation (most of us have neither the mutation nor the virus), the virus has a high virulence, and genetic analysis points to a recent introduction in humans.

[CobaltBlue]

Regardless, so far the only disease the CCR5-Delta 32 deletion is known to protect against is HIV-1. So far, they've tested it in association with hepatitis C, rheumatoid arthritis, diabetes, multiple sclerosis, Crohn's disease, myocardial infarction, and has been discounted in all but MI.

But who knows, I could be wrong.