The HLA-DRB1*11:04 and -DRB1*03:01 are associated with protection against SARS-CoV-2 infection [35,36,37], while the latter is also associated with susceptibility and/or severe SARS and SARS-CoV-2 (when occurred as haplotype HLA-A*:01:01g-B*08:01g-C*07:01g-DRB1*03:01g) [35] infection in other studies together with HLA-DRB1*08:01, -DRB1*12:02, -DRB1*15:01 and -DQB1*06:02 [36,38]. Here, HLA-DRB1 is linked to infection.