CD79A and infection: Additionally, total and specific IgA and IgG antibodies against several pathogens, such as SARS-CoV-2, pneumococcus, Neisseria meningitidis, influenza A, and pertussis toxin, can be induced in human milk after maternal natural infection or immunization, and these antibodies are able to neutralize pathogens and protect the nursing infants (2, 21–24).