Final answer:
Anaphylaxis is a severe allergic reaction triggered by an allergen, resulting in systemic symptoms like skin rashes, difficulty breathing, and swelling.
Explanation:
Anaphylaxis is a severe allergic reaction that occurs when the body's immune system overreacts to an allergen, leading to a rapid, systemic response throughout the body. This can happen after ingestion, inhalation, contact, or injection of the allergen. Symptoms include skin rashes, difficulty breathing, swelling, nausea, and in severe cases, a drop in blood pressure.
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