The delayed allergy - A type of hypersensitivity reaction that, unlike most forms of allergy, does not develop immediately on exposure to a particular allergen (a normally harmless substance that causes a reaction in people who have become sensitized to it).
Delayed allergies, also called type IV hypersensitivity reactions, may result from bacterial, viral, fungal, or protozoal infections or from vaccination with a live virus vaccine. Examples of such delayed allergic reactions include contact dermatitis and the body’s response to infection in tuberculosis.
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