Risk Factors for Hen's Egg Allergy in Europe: EuroPrevall Birth Cohort.

Background: Hen's egg is one of the commonest causes of food allergy, but there are little data on its risk factors.

Objective: To assess the risk factors, particularly eczema, for hen's egg allergy in the EuroPrevall birth cohort.

Methods: In the pan-European EuroPrevall birth cohort, questionnaires were undertaken at 12 and 24 months or when parents reported symptoms.