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Prior exposure to poison ivy or oak increases risk for delayed allergic reactions to mangoes. This cross-sensitivity is due to similar compounds, urushiol and 5-resorcinol, triggering a T-cell mediated immune response.

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Area of Science:

  • Immunology
  • Dermatology
  • Allergology

Background:

  • Poison ivy and oak (Anacardiaceae family) contain urushiol, a known allergen.
  • Mango fruits, particularly peels, contain 5-resorcinol, a compound structurally similar to urushiol.
  • Type IV hypersensitivity reactions are cell-mediated immune responses involving T cells.

Observation:

  • A case study of a healthy male with a history of poison ivy exposure.
  • The patient presented with a delayed, significant allergic reaction after consuming mango fruit.
  • Detailed patient history revealed prior exposure to poison ivy.

Findings:

  • Cross-sensitization between poison ivy/oak and mango fruit is a likely cause of the patient's reaction.
  • The reaction mechanism involves T cells responding to overlapping antigens (urushiol and 5-resorcinol).
  • This constitutes a delayed-type hypersensitivity (Type IV) response.

Implications:

  • Prior exposure to urushiol-containing plants may predispose individuals to mango fruit allergy.
  • Identifying plant-food cross-reactivity is crucial for diagnosing delayed hypersensitivity reactions.
  • Clinical history of plant exposure is vital for understanding food-related allergic presentations.