CD79A and infection: Although it is known that serum IgA levels present a minor impact on immune protection in the mucosa [47,48], it is not fully understood whether serum IgA levels could be correlated with an adequate IgA response in the mucosa [49], improving the immune response to infection by SARS-CoV-2, as it was reported that IgA antibody responses were associated with lower viral shedding [49].