CD79A and COVID-19: Furthermore, prospective cohort studies have found that anti-SARS-CoV-2 IgA and IgG generated by anti-COVID-19 mRNA-based vaccines administered to lactating and pregnant mothers are transferred to their babies via breastmilk [14, 20, 21] and umbilical cord blood [22, 23], while COVID-19 mRNA is not transferred [14, 24, 25].