Most frequent three-gene class I HLA haplotypes in a Mexican cohort of HIV-positive individuals. Genetic frequencies were calculated for 292 HIV-positive individuals from Central/Southern Mexico. Gametic phase for each individual was estimated using the pseudo-Bayesian algorithm ELB, using the program Arlequin v3.11. HLA-A, B and C genes were typed at low/medium resolution by SSP-PCR as described in Methods. Haplotypes with frequencies over 1% in the cohort are shown.