Eosinophilic oesophagitis (EO), an isolated eosinophilic inflammation of the oesophagus, is the most common of the eosinophilic gastrointestinal disorders. EO is of increasing clinical significance in many developed countries,1 in parallel with the recent increase in food allergic disorders. A retrospective study of Western Australian children reported a dramatic rise in prevalence of EO (from 0.05 cases per 10 000 children in 1995 to 0.89 cases per 10 000 children in 2004) (Level III-2).2 The estimated prevalence in the US population aged 0–19 years is even higher, at 4.3 cases per 10 000 individuals.3
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