ABO and COVID-19: Only the study by Kousathanas et al45 found some significant associations between certain proteins and COVID-19, such as ICAM5 (Intercellular Adhesion Molecule 5 gene), GOLM1 (Golgi membrane protein 1), ICAM5, FAM3D (Family with Sequence Similarity 3, Member D), PDGFR (Platelet-Derived Growth Factor Receptor), CD209 (Cluster of Differentiation 209), ABO (ABO Blood Group), F8 (Coagulation Factor VIII), IL3RA (Interleukin 3 Receptor Alpha), and SELE (Selectin E).