HLA-C and COVID-19: Other HLA alleles associated with COVID-19 susceptibility, severity or mortality in other studies including Spanish populations yielded no statistically significant associations in our study, such as HLA-A*03, HLA-B*39, HLA-C*16 and HLA-A*32 [7] for COVID-19 infection susceptibility; HLA-C*04:01 [10] and HLA-A*01 [12] for disease severity; and HLA-A*11, HLA-C*01, DQB1*04 [7] and HLA-A*02:01 [11] for death.