It has been reported that upon infection with SARS‐CoV‐2 or influenza viruses, IgA antibodies are secreted in saliva to neutralize the viruses (Sterlin et al., 2021; Tsunetsugu‐Yokota et al., 2022), suggesting that viruses may also serve as inducers of IgA antibodies in saliva. Here, CD79A is linked to infection.