HLA-B and HIV-1 infection: It is important to note that our N of 171 individuals with acute HIV-1 infection gives 94% power to detect a 1 log10 difference in viral load between the HLA-B*57 and non-HLA-B*57 groups (2-sided Wilcoxon rank sum test with alpha=0.05), thus our threshold for significant differences between the groups was relatively high.