Just like for the IgA AZA, the serum IgA AGA levels were statistically significantly higher in the CD patients (CD median 47.15 (range, 8.87–201.54); mean 69.2) versus the IBS patients (IBS median 12.44 (range, 1.53–162.42); mean 19.05; p < 0.0001) and the HCs (HC median 12.09 (range, 2.75–208.18); mean 19.4; p < 0.0001) There were no differences in the serum levels of IgA AGA between the IBS patients and the HCs (p > 0.05). Here, CD79A is linked to irritable bowel syndrome.