In this context, a recent study by Svärd et al. (2023) analyzing a cohort of patients with rheumatoid arthritis (a periodontitis‐related systemic disorder) demonstrated that production of IgA against Pg gingipains in the salivary glands was not accompanied by systemic antibody production supporting the localized mucosal activity of this antibody. Here, CD79A is linked to periodontitis.