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person eats an allergen or substance that causes an allergic reaction for the first time
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after the person eats the allergen, the body will then create an antibody/protien that finds other harmful substances
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the antibody attaches itselft to cells found in tissues throughout the body so it can prepare the body for if/when that allergen enters the body again
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after entering again, it binds to the antibodies and sends out signals to release large amounds of histamine
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the histamine then causes irritation and swelling in differnet parts of the body
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irritation varies among people (mild hives, shortness of breath, anaphylaxis)
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