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If vaccines work by introducing a small amount of a foreign substance to your body to trigger an immune response to develop resistance, why don’t allergies work the same when they also trigger an immune response when exposed to something foreign to the body?

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If vaccines work by introducing a small amount of a foreign substance to your body to trigger an immune response to develop resistance, why don’t allergies work the same when they also trigger an immune response when exposed to something foreign to the body?	3299