immediate allergy

Medical Dictionary

immediate allergy im·me·di·ate allergy (ĭ-mē'dē-ĭt)
n.
Hypersensitivity that becomes evident within seconds or minutes after contact with an antigen, reaches its peak within an hour or so, then recedes.

The American Heritage® Stedman's Medical Dictionary
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WordNet
immediate allergy

noun
an allergic reaction that becomes apparent in a sensitized person only minutes after contact 
WordNet® 3.0, © 2006 by Princeton University.
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