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When a person first eats an allergen it creates no adverse affects on the outside.
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The body creates IgE antibodies, a protein that detects harmful substances, in reaction to the allergen.
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The antibodies attach themselves onto cells all around the body to brace for the next time the specific allergen is eaten.
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When the allergen is eaten the second time the allergen attaches itself to the IgE antibodies. This sends out a signal to the rest of the body to release the compound called histamine that triggers the immune system response.
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The histamine causes the allergic reaction which includes swelling and irritation in certain parts of the body.
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the severity of the reaction is unique with every person. They may experience anaphylaxis, which could result in death, or they may just experience hives and a shortness of breath.
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