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An '''allergy''' is a reaction of the [[immune system]]. The term allergy is also known as hypersensitivity. People who have allergies often are sensitive to more than one thing. Substances that often cause reactions are
An '''allergy''' is a reaction of the [[immune system]]. The term allergy is also known as hypersensitivity. People who have allergies often are sensitive to more than one thing. Substances that often cause reactions are