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Herxheimer's reaction

(hûrkshī′mərz, hĕrks-)
n.
  1. An inflammatory reaction in tissues infected by spirochetes, as in syphilis or Lyme's disease, induced in certain cases by treatment with salvarsan, mercury, or antibiotics. Jarisch-Herxheimer 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.