CD79A and COVID-19: These four isotype-antigen pairs, as well as IgA to EBV EA-D and N OC43, and IgG to CMV pp150 were part of mixtures associated with COVID-19 (all protective), with most ORs between 0.2 and 0.4 (all p ≤ 0.03; Table 9; Figure 2, column 2.