IVIg administration did not alter CD32a expression on naïve and memory B cells before (p = 0.16 [naïve B cells], p = 0.66 [memory B cells]) and after (p = 0.25 [naïve B cells], p = 0.06 [memory B cells]) COVID-19 vaccination (Fig. 1B-C). This evidence concerns the gene FCGR2A and COVID-19.