Hypersensitivity (immunology) - Definition

April 2017


Definition


Hypersensitivity relating to an immunological process is an exaggerated, even dangerous, reaction to an intrusion, no matter how small, in the body, that would not have provoked a reaction in those that are not hypersensitive. This immune response can be generated by a toxin, virus, bacteria, or allergen. Certain reactions are called allergies, which can be severe enough to be fatal, such as cases of anaphylactic shock. Hypersensitivity initially presents a sensitizing phase, followed by a latency phase. During the lesion phase, in other words on second contact with the allergen, the symptoms appear.

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Original article published by . Translated by Jeff. Latest update on November 19, 2013 at 11:03 AM by Jeff.
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