delayed allergy

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delayed allergy

The child developed a delayed allergy after eating the new food.

Definition
  1. Noun:
    • An allergic reaction that becomes apparent only hours after contact: A type of hypersensitivity response where symptoms develop and are noticeable a significant time (typically several hours) after exposure to an allergen, in contrast to immediate allergic reactions.
Usage
  • The term "delayed allergy" is used in medical and immunological contexts to classify and describe hypersensitivity reactions based on their timing.
  • It often refers to reactions mediated by T-cells rather than antibodies, such as contact dermatitis.
Examples
  • Noun:
    • The rash from poison ivy is a classic example of a delayed allergy, appearing 24 to 48 hours after touching the plant.
    • Doctors diagnosed it as a delayed allergy to the metal in her earrings, as the inflammation developed a full day after she wore them.
Advanced Usage
  • "Cell-mediated delayed allergy": A more specific term emphasizing that T lymphocytes (a type of white blood cell) are responsible for the slow-onset reaction.
    • Contact dermatitis to nickel is a cell-mediated delayed allergy.
Variants and Related Words
  • Delayed-type hypersensitivity (DTH) (n): The formal immunological term for a delayed allergy.
    • The tuberculin skin test checks for delayed-type hypersensitivity to tuberculosis bacteria.
  • Contact dermatitis (n): A common skin condition that is often a manifestation of a delayed allergy.
    • Many cases of contact dermatitis are due to a delayed allergy to substances like fragrances or preservatives.
Synonyms
  • Delayed hypersensitivity: A direct synonym often used interchangeably in medical literature.
  • Type IV hypersensitivity: The technical classification within the Gell and Coombs system of allergic reactions.
Antonyms
  • Immediate allergy: An allergic reaction where symptoms appear within minutes of exposure, such as hay fever or anaphylaxis.
  • Type I hypersensitivity: The technical classification for immediate, antibody-mediated allergic reactions.
delayed allergy

The child developed a delayed allergy after eating the new food.

Noun
  1. an allergic reaction that becomes apparent only hours after contact

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