Interestingly AABs to the vaso- and immunoregulatory receptors CXCR3, CHRM5, BDKRB1, MAS1, AGTR1, F2R/PAR-1, and STAB1 were the most significant classifiers of acute COVID-19 severity in our recent study (19). This evidence concerns the gene BDKRB1 and COVID-19.