CD79A and infection: Surprisingly, the IgA antibody levels remained high, even at seven months post-infection (anti-spike protein RBD IgA RLU: 138,475 ± 26,834; anti-spike protein RBD IgM RLU: 18,084 ± 967; anti-spike protein RBD IgG RLU: 36,991 ± 7665) (Figure 2b).