CD79A and selective IgA deficiency disease: Data on this large sample size confirmed our previous results [7]: (i) the better sensitivity of IgA anti-TG2 compared to IgA EmA for the diagnosis of CD; (ii) IgA EmA positivity was always found in patients with IgA anti-TG2; (iii) about two-thirds of subjects who tested negative for IgA TG2/EmA also had IgA deficiency (while being positive for IgG anti-TG2/DGP); and (iv) only a small subgroup of patients had seronegative CD (1.2%).