A 42-year-old member asked:
Do you have allergies to tiny amounts like in allergy testing if first exposure?
1 doctor answer
Dr. Paul Carter answered
29 years experience in Allergy and Immunology
Exposure required: Previous exposure to the allergen or at least a very similar allergen is required to have a reaction to subsequent exposures. This is because your immune system begins making allergic (ige) antibodies after your initial or sensitizing exposure making a reaction possible on later exposure.
Answered on Jun 12, 2015
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