ABO and COVID-19: This is in line with the recent GWAS that associates locus 3p21.31 (rs11385942), comprising the solute carrier SLC6A20 (Na+ and Cl- coupled transporter family), and locus 9q34.2 (rs657152) that is coincident with the ABO-blood group (rs8176747, rs41302905, rs8176719) to Italian and Spanish severe COVID-19 patients with respiratory failure [89].