Clinical characterization of Chilean patients with IgE-mediated food allergy

Background: Food allergy (FA) is an entity of high and growing prevalence,which can be mediated by IgE or cellular immunity. It can have a wide range of symptoms and be triggered by multiple food antigens, which vary in different geographical areas. Objectives: To describe clinical characteristics of Chilean patients with IgE-mediated FA, Patients and Method: Retrospective review of patients with IgE-mediated FA treated at a tertiary healthcare center in Santiago, Chile, between 2006 and 2016. Demographic characteristics, clinical manifestations, and trigger foods were evaluated. Results: A total of 282 patients diagnosed with IgE-mediated FA were included. 89% had FA onset before 18 years of age and most of these before one year of age (median of age: one year; range: one month-55 years). The most common clinical manifestations were hives, angioedema, dyspnea, and vomiting. 40% had symptoms compatible with anaphylaxis. The foods most frequently involved were egg, cow's milk, peanut, shellfish, walnut, tomato, wheat, avocado, fish, and legumes. Egg, cow's milk, and peanut allergies were the most frequent at pediatric age, while seafood allergy was the most frequent among adults. Conclusion: Foods causing IgE-mediated FA in Chile were similar to those described in other countries, although the frequency of tomato and avocado allergy, which are unusual in internationalseries, stands out. Anaphylaxis incidence was high, emphasizing the need for epinephrine autoinijectors in Chile.