On the other hand, Pullen et al., when analyzing the serological profile of colostrum samples from breastfeeding mothers previously infected with SARS-CoV-2 during pregnancy, showed that women who had more severe COVID-19 transferred higher levels of IgG and IgA binding to the Fc receptor against several SARS-CoV-2 specificities in breast milk. Here, CD79A is linked to COVID-19.