CD79A and COVID-19: Interestingly, 4 out of the 11 patients who declared past COVID-19 had no SARS-CoV-2 antibodies (negative for anti-S IgG and IgA, and for anti-NCP IgG), and 2 patients had only anti-S IgG antibodies (mean titer 636.2 ± 124 BAU/mL), with no detectable anti-NCP antibodies.