I propose there may be SNPs ‘like’ the ccr5 d32 mutation that confers partial immunity to HIV infection.
IN THE NEAR FUTURE:
>Woman saves three relatives from Ebola
pays for plane tickets to U.S.
True, and that possibility is what I allude to in post #39. However, in order to develop a resistant sub-population a cytologic immunity would require earlier epidemics that killed large numbers of non-resistant people [or, alternatively, the fecundity of those with better resistance would have to be significantly higher than the background population ... which seems very far fetched.]
Unless that happened, we have no reason to believe that a sub-population of Africans with resistance was any more likely than a sub-population of Asians or Europeans with resistance. And that is my point: we have no evidence of an outbreak that would lead to a higher than normal expression of a resistant genome in any modern or colonial history. The preference of expression for alleles requires environmental pressure. And we just don't have any evidence of that.