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Possible definitions for anaphylaxis
anaphylaxis
Severe, immediate, often fatal bodily reaction to contact with a substance (antigen) to which the individual has become sensitized by a prior exposure that provoked no reaction. It is often triggered by antiserum, antibiotics, and insect stings; symptoms include skin flushing, bronchial swelling (with difficulty breathing), and loss of consciousness. Shock may follow. Milder cases may involve hives and severe headache. Treatment, consisting of injection of epinephrine, followed by antihistamines, cortisone, or similar drugs, must begin within minutes. Anaphylaxis may be caused by extremely small amounts of antigen.
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