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Altered reactivity to an antigen, which can result in pathologic reactions upon subsequent exposure to that particular antigen.

Year introduced: 1966

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Tree Number(s): C20.543

MeSH Unique ID: D006967

Entry Terms:

  • Hypersensitivities
  • Allergy
  • Allergies
  • Allergic Reaction
  • Allergic Reactions
  • Reaction, Allergic
  • Reactions, Allergic

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