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An allergy occurs when the body reacts to substances it views as harmful. The substances, such as tree pollen or dust mites, are called 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 cells--special cells found in the tissues of the respiratory and digestive systems.
Subsequent exposure to even a small amount ... more
