CD79A and infection: SARS-CoV-2-specific IgA levels in the human milk of the two participants vaccinated after a previous PCR-confirmed SARS-CoV-2 infection were higher than those in the infection group and the vaccination group: mean AUCG of 71.1 ± 8.3 (p < 0.05) and mean AUCcutoff of 36 ± 8.3 (p < 0.05).