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A member asked:
Could allergies take a week to react ?
A doctor has provided 1 answer
Not usually: Usually allergic reactions are immediate . Some allergies are "delayed" somtimes for 24-48 hours for example Poison Oak, Ivy etc (Called "delayed hypersensitivity") Some medications are like the latter (eg Sulfa drugs). Hope this helps Dr Z
Answered 9/28/2016
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