HIV
From SNPedia
rs333 (aka CCR5Delta32) is the most well known snp influencing HIV, however there are many others.
This link provides a large number of variations related to HIV [1]
HIV-infected individuals vary in the amount of virus circulating in their bloodstream, and some SNPs appear to influence this 'viral load' level. [It's generally agreed that less virus is better than more virus, especially in terms of the risk of developing AIDS.]
SNPs associated with altered viral susceptibility or viral load include:
See also AIDS