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In 1996, a 50-year-old woman received the diagnosis of type 1 diabetes. Shortly after insulin therapy was initiated, a generalized urticarial rash (resulting in excoriation, bleeding, and disrupted sleep) developed. Insulin allergy was diagnosed on the basis of positive skin-prick tests and a level of insulin-specific IgE of 5.75 kU per liter (normal value, <0.70 kU per liter). Until 2000, she was treated with a standard stepwise approach of trying
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