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Rickettsia rickettsii

(rĭ-kĕtsē-ī′)
n.
  1. A bacterium that causes a variety of spotted fevers throughout the world including Rocky Mountain spotted fever.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.