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Some more context would be helpful. This question sounds like it may be asking about antigen exposure in the field of allergic disease, but it's hard to be sure. Hypersensitivity reactions (the immune system basis for Allergies) are based on the principle that allergy follows initial sensitization to an antigen.

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16y ago

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The initial exposure to an antigen (allergen) that causes an allergic response is called sensitization.

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14y ago
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Q: The initial exposure to an antigen is called?
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