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Researchers analyzed data from over 150 tree nut oral food challenges conducted at one medical center. Patients were classified as the following: allergic to tree nuts if they had symptoms after tree nut ingestion; sensitized to tree nuts if they only had positive results on skin prick or serum-specific immunoglobulin E testing; or avoiding nuts despite no sensitization or clinical history. Patients weren't given an oral challenge to nuts for which they'd had an allergic reaction.
Overall, 86% of oral challenges were passed. Among those with a previous reaction to ingesting tree nuts, the passage rate of the oral challenge for other nuts to which they were sensitized was 76%. For those without a history of tree nut ingestion, the passage rat…