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American Association of Colleges of Nursing (AACN)The American Association of Colleges of Nursing (AACN) represents 550 schools of nursing at public and private universities and senior colleges nationwide. |
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 | Ask a Nurse An allergy is a hypersensitivity to a normally harmless substance. The body's immune system perceives these substances, called allergens, as harmful and reacts accordingly. White blood cells produce antibodies that neutralize the allergen. |
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