[-induced immunglobulin E-dependent allergic anaphylaxis in Crohn's disease. ].

Immunglobulin E (IgE)-based, irregularly recurring, severe anaphylactic reactions occurred in a 50-year-old European white male patient suffering also from Crohn's disease. On the base of immunologic laboratory tests concerning the mechanism of the phenomenon, the idea arose whether molecules derived for certain microbial derivatives could enter the blood circulation the damaged bowel walls in the patient with Crohn's disease and they might act as allergens. The microbial analysis diagnosed atypical in the stool. The serum level of IgE was very high. The concomitant use of targeted antibiotics and anti-allergy and immunosuppressive agents resulted in a complete remission during a couple of months. Not only Crohn's disease has improved, but also the total serum IgE level has decreased significantly, and the unpredictable anaphylactic attacks have been completely eliminated. In Crohn's disease, the anaphylactic complications induced by atypical microbial allergens ( derivatives of ) can be effectively treated after the recognition of this pathological mechanism. This is the first description of such a pathologic state. Orv Hetil. 2019; 160(38): 1514-1518.