CCR5 and AIDS: To assess whether the CCRL2-167F association with PCP was due to LD (D′ = 0.76, r2 = 0.47) with CCR5-2459 that associated with AIDS progression [16], we restricted the analysis in a group of SC (n = 365) that do not carry the homozygous CCR5-2459 genotype; the CCRL2-167F association with PCP remained significant (OR = 2.42, 95% CI 1.09–5.36), in support of its independent role.