CD79A and infection: Of note, the salivary IgA titer was more than doubled in subjects who had developed a SARS-CoV-2 infection despite vaccination compared to those who only entered in contact with the spike viral protein through vaccination (796.2 ± 298.6 U/mL vs. 351.5 ± 31.77 U/mL, p = 0.001), confirming that a naturally occurring infection is more effective than current available vaccines at inducing oral IgA production, as previously reported [8].