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Yersinia pestis

(pĕstĭs)
n.
  1. A bacterium that causes plague and is transmitted from rats to humans by the rat flea Xenopsylla cheopis.Pasteurella pestis
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.