Background
Due to changes in dietary habits tree nuts (TN) are consumed in many households and TN allergy appears to be increasing. One risk factor seems to be allergies to other food such as peanuts. The aim of our study was to investigate, how often peanut-sensitized infants and toddlers are co-sensitized to cashew, hazelnut and walnut and to determine the likelihood of its clinical relevance by their 2S albumin-specific (s)IgE.