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immediate reaction in Medicine

immediate reaction

n.
  1. An allergic or immune response that begins within a period lasting from a few minutes to about an hour after exposure to an antigen to which the individual has been sensitized.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.