Higher venom-specific IgE levels differentiate children with previous local large reactions from children with previous systemic reactions of different severity

Abstract

Introduction: Risk factors for systemic reactions (SRs) from hymenoptera venom (HV) allergy are well known in the adult population but they have been little studied in the pediatric one. Method: The aim of our study was to identify risk factors for SRs in a population of children allergic to HV, comparing a series of clinical (age, gender, atopy, asthma) and laboratory (total IgE, tryptase, venom-specific IgE levels) variables between patients with at least two large local reactions (LLRs) and patients with SRs of different severity for the identified insect. We selected a population of HV allergic children aged <15 years with LLRs or SRs stratified according to Mueller grades after stinging. Results: The population included 80 children, 35 with at least 2 LLRs and 45 with SRs. The level of specific IgE for vespid (Polistes dominula, Vespula species) venoms was significantly higher (p = 0.0321) in children with SRs (Mueller grade II+III+IV) than in those with LLRs and the same significance was also found for specific IgE for Apis mellifera, considering SRs group (Mueller grade I+II+III+IV) in respect with LLRs group (p = 0.0001). Conclusion: The main difference in our pediatric population was the highest level of specific IgE in children with a history of SRs compared to those with a history of LLRs for both vespids and honey bees. These results, once confirmed on a larger population, could suggest the opportunity to follow the behavior of venom specific IgE in children with LLRs to reveal a risk to develop future more serious reactions.