Impact statement
Sensitization to hazelnut, cashew and walnut seems to be common among peanut-sensitized infants and toddlers. They also seem to be frequently sensitized to the corresponding tree nut 2S albumins, what might be associated with clinical reactivity to these tree nuts. Based on our findings, it should be considered to test peanut-sensitized infants and toddlers also for sensitization to tree nuts if these have not been introduced into the diet so far.