what is allergy???? plzzz explain it more clearly........

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it is an hypersensitivity disorder of immune system.

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allergy is the hypersensitiveness of a person to some foreign substance coming with or entering the body.

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Anallergyis ahypersensitivity disorderof theimmune system.[1]Allergic reactions occur when a person's immune system reacts to normally harmless substances in theenvironment. A substance that causes a reaction is called anallergen. These reactions areacquired, predictable, and rapid.

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