SLC6A20 and COVID-19: In summary, the following genetic loci were shown to have genome-wide statistical significance in several COVID-19 GWAS: the blood type ABO locus; a cluster of immune system genes (SLC6A20, SMRR1, and the immunoglobulin lambda locus) [6,7]; a gene cluster encoding antiviral restriction enzyme activators neighboring the TYK2, DPP9, and IFNAR2 genes [8]; the IVNS1ABP/SWT1 gene cluster [7]; and the MYH14, SETX, ATXN1, and SCN11A genes [9].