Another study published a genetic hypothesis on the role of the renin-angiotensin system (RAS) genes—ACE1 (Angiotensin-converting enzyme 1), ACE2 (Angiotensin-converting enzyme 2), and ABO-locus (rs495828, rs8176746) in COVID-19 prognosis, suspecting inherited genetic predispositions to be predictive of COVID-19 severity [51]. The gene discussed is ABO; the disease is COVID-19.