CD79A and common variable immunodeficiency: Indeed, in 4/4 CVID patients with serum IgA > 0.1 g/L and 9/9 HC, IgA + plasma cells were detected (Fig. 2A, B), while they were absent in 10/11 CVID patients with serum IgA < 0.1 g/L (Fig. 2C).