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An allergy occurs when the body reacts to substances it views as harmful. The substances, such as tree pollen, dust mites, or foods, are called allergens. They are usually harmless, but the immune system of a person with allergies defends the body against these allergens.
Following the body’s first exposure to an allergen, white blood cells produce antibodies that prepare the immune system for the next encounter with the same allergen. Antibodies attach themselves to mast ... more
