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Diagnosing tree nut allergies can be complex. This study found that while many patients are sensitized to multiple nuts, allergies are often specific, improving diagnostic accuracy and reducing the need for oral food challenges (OFCs).

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Area of Science:

  • Allergy and Immunology
  • Clinical Diagnostics
  • Food Hypersensitivity

Background:

  • Diagnosing tree nut allergy presents challenges, often requiring oral food challenges (OFCs) or broad elimination diets.
  • Coincidences between different tree nut allergies are not fully understood, complicating accurate diagnosis.

Purpose of the Study:

  • To investigate the co-occurrence of allergies among various tree nuts.
  • To enhance diagnostic methods for tree nut allergies to minimize the necessity of OFCs.

Main Methods:

  • Eighty-three patients underwent evaluation for allergies to walnut, pecan, cashew, pistachio, hazelnut, and almond.
  • Standardized skin prick tests (SPTs) and basophil activation tests (BAT) were performed.
  • Oral food challenges (OFCs) were conducted for specific tree nuts based on patient history and prior testing.

Main Results:

  • Most patients showed sensitization to multiple tree nuts, but over 50% were allergic to only one or two.
  • Walnut and cashew allergies were most prevalent among sensitized individuals.
  • Specific co-allergy patterns were observed between walnut/pecan and cashew/pistachio, with high rates of cross-reactivity.

Conclusions:

  • Understanding coincident tree nut allergies aids in differentiating allergic from tolerant patients.
  • Combining SPT and BAT with knowledge of cross-reactivity improves diagnostic accuracy.
  • These findings can reduce the need for OFCs and guide appropriate dietary elimination recommendations.