2. In the context of the clinical approach of our service, parents will fill out an auto-administered questionnaire on the clinical history of their child's egg allergy. This questionnaire will take approximately 15 minutes to complete. The allergist will verify the answers with the parents and will proceed to examine the child including an examination of the skin and pulmonary auscultation at most 30 minutes prior to vaccination. For the control subjects, the physical exam will also be done by the allergist in the clinic.