Acute food protein-induced enterocolitis syndrome in Switzerland: A 10-year retrospective review

Purpose Food protein-induced enterocolitis syndrome (FPIES) is a non-immunoglobulin E-mediated food allergy that typically causes delayed gastrointestinal symptoms following the ingestion of a trigger food. FPIES is a rare condition with limited epidemiological data. This study aimed to investigate the demographic characteristics, triggers, clinical presentations, and outcomes of children with acute FPIES at the University Children’s Hospital Zurich, a tertiary-level children’s hospital in Switzerland, with a dual focus on confirmed and suspected FPIES case. Methods This retrospective study covered a 10-year period (2010–2020). Electronic medical records were screened for patients diagnosed with acute FPIES and those with symptoms suggestive of FPIES according to international diagnostic criteria. Those paediatric patients with an acute FPIES diagnosis or a history highly suggestive of FPIES were included. Results A total of 109 patients with acute FPIES were identified. Cow’s milk (CM) was the most common food trigger (24%), followed by eggs (12%), and fish (10%). A single food trigger was identified in 56% of the patients. The median age of onset was 6 months (interquartile range (IQR), 4 months). Gender had no effect on observed FPIES cases. Data on FPIES tolerance and therefore resolution of FPIES symptoms and/or successful reintroduction of the triggering food were limited, with sufficient follow-up information available for only 37% of cases. This lack of comprehensive follow-up hindered a thorough evaluation of tolerance development in the study population. Conclusion The study contributes practical epidemiological and clinical insights into FPIES triggers, patterns, and patient characteristics, and provides further regional insights to navigate this complex condition.