Young et al. compared the temporal breast milk IgA and IgG responses and microneutralization activity against SARS-CoV-2 between breastfeeding mothers with PCR-confirmed COVID-19 and breastfeeding mothers vaccinated with Pfizer-BioNTech (BNT162b2) or Moderna (mRNA-1273) up to 90 days after infection or vaccination. This evidence concerns the gene CD79A and infection.