Clinical Research Directory

Inclusion Criteria: All children (aged 12 months and older) presenting (since 1-1-2014: moment of diagnostic guideline standardization for pedEoE) with diagnosed pedEoE at UZ Leuven eliminating either hen's egg or cow's milk or both and in complete remission after their latest biopsy (no longer than 12 months earlier, but preferentially as short as possible after their latest biopsy) are eligible for the study. If the last biopsy has been performed more than 12 months earlier, a new gastro-duodenoscopy will be performed to verify remission and rule out e.g. active gastritis. If they are on PPI and/or local budesonide treatment, this should be stable for at least 3 months and will remain untouched during the entire study. We will include 18 pedEoE subjects suffering from cow's milk induced EoE and 18 suffering from hen's egg induced EoE. Exclusion Criteria: * Children younger than 12 months * Children with active pedEoE * Children who refuse to adhere to the protocol * Children with associated IgE mediated hen's egg and/or cow's milk allergy with specific IgE antibody titers that predict active (baked egg and/or baked milk) food allergy with cut-off titers as used at the consultation of allergy (KLL). Those children will become eligible however if their titers decrease while the study is still open.