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Uploaded on May 8, 2011
Shigella (Shigella sonnei, S. boydii, S. flexneri and S. dysenteriae) are Gram-negative, nonmotile, nonsporeforming rod-shaped bacteria. The illness caused by Shigella, known as shigellosis, accounts for less than 10% of the reported outbreaks of foodborne illness in the United States. Still an estimated 300,000 cases of shigellosis occur annually in the U.S. The number attributable to food is unknown, but given the low infectious dose, it is probably substantial.