Allergic to one tree nut, for example, walnuts, does not mean that all nuts can cause allergy. New research strongly suggests you should consider having an oral food challenge to properly diagnose additional nut allergies, especially if you''ve never had a reaction to eating those tree nuts before. If you have a tree nut allergy and were advised to avoid other tree nuts based only on a positive blood or skin prick test, you may not be allergic to the other nuts. A new study showed among people allergic to one nut who have a positive test to other tree nuts, more than half passed an oral food challenge to other tree nuts without a reaction.
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