CD79A and common variable immunodeficiency: Among those with PID, the most common diagnosis was common variable immunodeficiency (CVID) (39.8%, n=88), followed by IgG subclass deficiency (6.3%, n=14), combined IgA and IgG subclass deficiency (5.9%, n=13), and syndromic immunodeficiencies (5.4%, n=12).