HLA-DRB1 and COVID-19: The dominant S166–180-specific TCRα clonotypes in HLA-DPB1*04:01+ individuals are associated with mild COVID-19 disease (Supplementary Fig. 3a), while the dominant S751–765-specific or S866–880-specific TCRα clonotypes in HLA-DRB1*15:01+ participants are associated with non-hospitalised COVID-19 (Supplementary Fig. 3b).