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Generally the best treatment is avoidance of the allergen. In some instances desensitization therapy is undertaken for medical reasons (the allergic reaction itself is particularly severe and thus potentially life-threatening), or even personal ones (the patient does not like the chronic, albeit nonlethal, symptoms). Desensitization involves immunization with the allergen, but by another route (e.g., intramuscular), which has been associated with production of cell-mediated immunity and Th1...