In medicine, anaphylaxis is a severe and rapid systemic allergic reaction. Anaphylaxis occurs when a person is exposed to a trigger substance, called an allergen, to which they have become sensitized. Minute amounts of allergens may cause a life-threatening anaphylactic reaction. Anaphylaxis may occur after ingestion, inhalation, skin contact or injection of an allergen. The most severe type of anaphylaxis—anaphylactic shock—will usually lead to death in minutes if left untreated. The w ...
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