CD79A and common variable immunodeficiency: We compared CVID patients with undetectable serum IgA levels (IgA < 0.1 g/L) to CVID patients with detectable serum IgA levels (IgA ≥ 0.1g /L) and found no significant difference in plasma TMAO concentration between these two groups (p = 0.844, Supplementary Table 5).