A reaction based on passive transfer of allergic sensitivity in which serum from an allergic individual is injected into cutaneous sites on a normal individual and the injected sites are then exposed to antigens to which the donor is allergic; the cutaneous sites show a characteristic wheal-and-flare reaction.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.