HLA-A and COVID-19: To find out if BA.1 Omicron evades the COVID-19 related CD8 + T cell immune response, we isolated PBMCs from ten convalescent individuals infected with the Delta variant, who possessed at least one of three HLA haplotypes (HLA-A*02:01, HLA-A*11:01 and HLA-A*24:02) (Table S1).