ABO and COVID-19: A recent GWAS found significant COVID-19 association signals at locus 3p21.31 (rs11385942), comprising the solute carrier SLC6A20 (Na+ and Cl-coupled transporter family), and at locus 9q34.2 (rs657152) coincident with the ABO blood group (rs8176747, rs41302905, rs8176719) in severe COVID-19 patients and interestingly, both loci are pharmacogenetically associated to the RAS-pathway (Chung et al., 2010; Severe Covid-19 GWAS Group, 2020).