CD79A and common variable immunodeficiency: While our study was not aiming to identify risk factors for chronic NV infection in CVID, it is remarkable that the prevalence of chronic NV infection seems higher in patients lacking PCs in the gastrointestinal mucosa as 12 out of 13 NV-positive patients (92%) in contrast to 24/29 NV-negative patients (83%) lacked mucosal IgA PCs and 10/13 NV-positive patients (76%) vs. 14/29 NV-negative patients (48%) all mucosal PCs (data not shown, for further information, see Table S1).