type IV allergic reaction

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Thân thiện
Definition
  1. Noun:
    • A delayed hypersensitivity reaction mediated by cells of the immune system (specifically T-cells), rather than by antibodies. It is an allergic reaction that becomes apparent only hours after contact with the allergen.
Usage
  • This term is used in medical and immunological contexts to classify and describe a specific mechanism of allergic response.
  • It is often contrasted with immediate hypersensitivity reactions (Type I, II, and III).
Examples
  • Noun:
    • Poison ivy rash is a classic example of a type IV allergic reaction.
    • The positive result for the tuberculin skin test indicates a type IV allergic reaction to the antigens.
    • Contact dermatitis from nickel in jewelry is caused by a type IV allergic reaction.
Advanced Usage
  • "Delayed-type hypersensitivity (DTH)": This is a synonymous term frequently used in medical literature.
    • The immunologist explained that the granuloma formation was due to a delayed-type hypersensitivity response.
Variants and Related Words
  • Cell-mediated hypersensitivity: Another technical term for this type of reaction.
  • Contact dermatitis: A common clinical manifestation of a type IV allergic reaction.
  • Hypersensitivity: The broader category of exaggerated immune responses, of which type IV is one kind.
Synonyms
  • Delayed hypersensitivity reaction
  • Cell-mediated immune reaction (in this specific allergic context)
  • Delayed-type hypersensitivity (DTH)
Related Phrases
  • T-cell mediated response: Describes the primary immune cells responsible for this reaction.
    • The pathology was consistent with a T-cell mediated response to the drug.
Noun
  1. an allergic reaction that becomes apparent only hours after contact

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