Cambridge Encyclopedia » Cambridge Encyclopedia Vol. 5

anaphylaxis - Emergency treatment, Symptoms, Causes, Treatment

severe occurs

A severe allergic reaction which occurs when an individual has been previously sensitized by contact with an allergen. It occurs within a few minutes of exposure, and the clinical response depends upon the tissue affected. Examples of local anaphylaxis include asthma, hay fever, red and itching skin weals (urticaria), and swelling of the tissues of the throat. A severe degree of generalized anaphylaxis (anaphylactic shock) may result in a sudden attack of wheezing, falling blood pressure, and collapse, and may be fatal.

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