CD79A and COVID-19: In accordance with other studies we found declining anti-RBD IgG antibody titers and IgA serum reactivity over time in dually vaccinated COVID-19 naïve persons [20], whereas the titers in boosted COVID-19 convalescents are higher and more stable [21–23].The two additional antibody attributes evaluated here describe further differences between dually vaccinated COVID-19 naïve individuals and boosted COVID-19 convalescents.