IgG and IgA Abs specific for ovalbumin, wheat, milk, S. cerevisiae-derived mannan, E. coli lysate, and B. fragilis lysate were quantified by ELISA in the serum of patients suffering from CD, UC, patients with non-IBD acute gastroenteritis/colitis (AGE) as well as age-matched controls without inflammation in the gastrointestinal tract. This evidence concerns the gene CD79A and inflammatory bowel disease.