CD79A and infection: Although the six participants with hybrid immunity (two doses of mRNA vaccine + infection) started from higher antibody levels due to infection, after the booster dose (BNT162b2), only their anti-S IgA levels were higher, but their anti-S1/S2 IgG and anti-RBD IgG antibody levels were interestingly even lower (mean 14.1 S/CO, 8041.7 AU/mL, 81.5 neutr (%), respectively) compared to group 1 who received the same vaccine regimen (three doses of BNT162b2) but were not infected (mean 11.2 S/CO, 8272.2 AU/mL, 98.3 neutr (%), respectively).