What refers to a systemic (whole-body) reaction characterized by breathing difficulty and low blood pressure?

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Anaphylaxis is a systemic reaction that involves multiple systems of the body and can be life-threatening. Symptoms include breathing difficulties and low blood pressure, among others. Hives and oral allergy syndrome are allergic reactions but are not typically associated with systemic reactions. Acute gastrointestinal response may be a symptom of anaphylaxis, but it is not a defining characteristic.

What Refers to a Systemic (Whole-Body) Reaction Characterized by Breathing