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Peanuts in the air ‐ clinical and experimental studies
Author(s) -
Lovén Björkman Sofia,
Sederholm Ulrika,
Ballardini Natalia,
Beck Olof,
Lundahl Joachim,
Nopp Anna,
Nilsson Caroline
Publication year - 2021
Publication title -
clinical and experimental allergy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.462
H-Index - 154
eISSN - 1365-2222
pISSN - 0954-7894
DOI - 10.1111/cea.13848
Subject(s) - peanut allergy , arachis , allergen , ingestion , allergy , peanut butter , arachis hypogaea , airborne allergen , food science , immunoglobulin e , chemistry , medicine , food allergy , immunology , agronomy , biology , antibody , biochemistry
Background Allergic reactions to food allergens usually occur after ingestion. However, fear of reactions to airborne peanut is a common concern for people with peanut allergy. There are no scientific reports on severe reactions with airborne peanut allergen. Objective To investigate the occurrence of allergic reactions in peanut‐allergic children undergoing airborne peanut challenge and to determine levels of airborne peanut protein in a separate experimental evaluation. Methods Eighty‐four children with peanut allergy underwent an airborne peanut challenge, 0.5 m from a bowl of peanuts for 30 min under controlled conditions. In a separate experiment, airborne peanut proteins from roasted and dry‐roasted peanuts were collected at varying distances and at varying times with an electret SensAbues filter connected to an air pump. Collected airborne peanut proteins were extracted, dissolved and detected by ELISA. Basophil activation test was used to confirm biological activity. Results No moderate/severe allergic reactions to airborne peanut allergens were observed. Two children (2%) had mild rhino‐conjunctivitis which required no treatment. The IgE‐antibodies to peanut or Ara h 2 did not predict a reaction. In the experimental set‐up, biological active peanut proteins were detected, in a very low amount, in median 166 ng/ml for dry‐roasted and 33 ng/ml for roasted peanuts and decreased dramatically when the collection occurred at a greater distance (0.5–2 m) from the peanut source. Increased exposure time did affect the amount of collected peanut protein at 0 m, and the highest median was obtained after 60 min ( p = .012); for time trend p = .0006. Conclusions and Clinical Relevance Allergic reactions to airborne peanut proteins are rare and cannot be predicted by high levels of IgE‐antibodies to peanut or Ara h 2. Only small amounts of biologically active peanut proteins were detected in the air and seem unlikely to trigger moderate/severe allergic reactions.