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Shigella
(shĭ-gel´ә)
a genus of gram-negative, facultatively anaerobic, nonmotile, rod-shaped bacteria containing four species that are differentiated
by biochemical reactions: S. dysente´riae (subgroup A), S. flex´neri (subgroup B), S. boy´dii (subgroup C), and S. son´nei (subgroup D). Their normal habitat is the intestinal tract of humans and higher monkeys; all species cause dysentery.

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