CD79A and infection: However,relatively few examples of such impacts have been described (but see refs. 32, 33).The growing realization that SARS-CoV-2 is initially a mucosal infection of the URT,and that it induces mucosal IgA antibody responses that may be critical to theoutcome of the initial infection, coupled with the likely presence of IgA1protease-producing bacteria in the sites of initial infection, should stimulateinvestigation of the potential intersection of these two phenomena in thepathogenesis of COVID and its transmission within the community (1).