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BackgroundBirch pollen‐associated plant food allergy is caused by Bet v 1‐specific IgE, but presence of cross‐reactive IgE to related allergens does not predict food allergy. The role of other immunoglobulin isotypes in the birch pollen‐plant food syndrome has not been investigated in detail.
MethodsBet v 1‐sensitized birch pollen‐allergic patients (n = 35) were diagnosed for food allergy by standardized...