An association study based on ~50,000 COVID-19 patients further supported the association of genetic variants in ABO, TYK2, DPP9, IFNAR2, SLC6A20 and Protein Phosphatase 1 Regulatory Subunit 15A (PPP1R15A) with the severity of COVID-19 [23]. This evidence concerns the gene PPP1R15A and COVID-19.