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The Shiga toxin, similar to Verotoxins found in E coli O157, inhibits protein synthesis.
Sigella is highly infectious and may be spread through the fecal-oral route.
It may also be found in eggs and lettuce.
Sigella resides in M cells in the gut,
Cholera Outbreak Training and Shigellosis (COTS) program
WHO - First steps for managing an outbreak of acute diarrhoea