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Allergies can produce a great deal of suffering. In America alone, around 28 million people suffer from hay fever, and that does not include all the people who are allergic to foods, dust, pet dander, and insect bites and stings.

Allergies are the result of an immune response gone overboard. Dust, pollen, dust mites, and other allergens are not pathogens, which cause disease, but for the allergic they can produce an extreme immune response with very uncomfortable symptoms. Allergy symptoms are no fun whether they are simply annoying or strong enough to be debilitating.