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Peanut allergy has tripled among children in the USA; now affecting over 1%.1 The reason for this increase is unknown. Ingestion of a potential allergen should induce oral tolerance. One theory suggests environmental exposure to food, through an impaired skin barrier such as eczema, could provoke allergy if the food is not being ingested.2 The authors of this study previously observed a rate of peanut allergy 10-fold higher among Jewish children in the UK compared with Jewish children in Israel.3 The notable difference is the virtual lack of …
Competing interests None declared.
Provenance and peer review Commissioned; internally peer reviewed.