Serum RBD-IgG and -IgA titers were ~16-fold and 5.4-fold higher, respectively, after vaccination compared to natural infectionMilk RBD IgG and IgA titers were 2-fold and 77-fold lower, respectively, after natural infection compared to vaccination.Binding and neutralizing antibodies were detected in infant cord blood. The gene discussed is CD79A; the disease is infection.