A Long Term, Observational Follow-Up Study of Children and Young People Who Underwent an 18-Month Course of Oral Immunotherapy Treatment for Peanut, Egg or Milk Allergy (5-15 Years Post-Treatment)

The goal of this observational study is to learn about the long-term outcomes of children and young people who underwent an 18-month course of oral immunotherapy (OIT) treatment for peanut, egg or milk allergy. It aims to: • Compare long-term changes in health-related quality of life (HRQL) at 5-15 years after stopping OIT in participants who achieved remission and those who did not. Participants will attend a single follow-up visit for: * A blood test * Skin prick test (SPT) * Allergy questionnaires