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Sonne bacillus

(sŏn′ə)
n.
  1. A gram-negative bacterium Shigella sonnei that causes a mild form of dysentery in adults and children.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.