CCR5 and infection: Notable differences in the frequency of the CCR5 Δ32 genotype were observed for baseline CDC category (CCR5 Δ32/wt genotype frequency among individuals diagnosed at asymptomatic stage of infection was 22.0% compared to 10.2% among symptomatic and AIDS patients, p<0.003) and overall number of deaths (the CCR5 Δ32/wt genotype was observed in 7.5% cases compared to 15.6% of patients surviving throughout the period of observation, p = 0.046).