HLA-DRB1 and COVID-19: In our work, we sequenced six HLA loci (class I (loci A, B, C) and class II (loci DRB1, DQB1, DPB1)) to compare the frequencies of HLA alleles and HLA haplotypes in three groups: (1) healthy donors from bone marrow registry, (2) patients who survived COVID-19 despite a severe course of a disease, and (3) patients who died from COVID-19 with an adjustment for age and comorbidities.