not-yet-known not-yet-known not-yet-known unknown We enrolled patients previously diagnosed with egg yolk FPIES. The inclusion criteria were: a) at least 6 months and <6 years old at the time of consent; b) diagnosed with egg yolk FPIES based on medical history or previous OFC using heated egg yolk, as stated in the International Consensus Guidelines for the Diagnosis and Management of FPIES1; c) under continuing complete elimination of egg yolk; and d) <3.5 kUA/L of specific IgE against egg yolk.