Ellinghaus et al.11 performed a genome-wide association study (GWAS) including Italian and Spanish patients with confirmed COVID-19 and controls and identified six candidate genes associated with the COVID-19 response on chromosome (chr) 3p21.31 (SLC6A20, LZTFL1, FYCO1, CXCR6, XCR1, CCR9) and one on chr 9q34.2, the locus harboring genes encoding ABO blood group antigens. This evidence concerns the gene ABO and COVID-19.