Every board-certified allergist first completes at least three years of specialty training in either internal medicine or pediatrics, and then completes an additional training program of two or more years studying the diagnosis and treatment of allergic and related diseases. Certification by the American Board of Allergy and Immunology requires not only approved training, but also successful completion of a challenging written examination. Every board-certified allergist thus has credentials in at least two specialties and is qualified to care for both children and adults.
The eosinophils appear to be particularly troublesome cells of inflammation. Eosinophils evolved to defend the body against parasites, much like IgE. Nevertheless, they are often present in great numbers in the blood of people with allergies . When they arrive at the site of the allergic reaction, they release chemicals that cause damage to the tissues and continue to promote the inflammation. Repeated episodes of this "late phase" reaction contribute to chronic allergic symptoms and make the tissues even more sensitive to subsequent exposure.
In addition, your allergist may prescribe epinephrine (adrenaline) in an auto-injector, to be taken in the event you develop symptoms of anaphylaxis a potentially fatal reaction that includes shortness of breath, swelling of the throat, and dizziness from a sudden drop in blood pressure. Your allergist will teach you how to use the auto-injector, which should be kept with you at all times and used as soon as symptoms start to appear. You or someone near you should also call for an ambulance, even if epinephrine provides relief, as the symptoms may recur.