ABO and COVID-19: Several publications have already reported that blood type groups are associated with COVID-19 susceptibility (Zhaoet al., 2020;Zietz, Zucker, and Tatonetti 2020), including genetic associations with the ABO blood group locus at 9q34.2(The Severe Covid-19 GWAS Group “Genomewide Association Study of Severe Covid-19 with Respiratory Failure” 2020).