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Shigella Bacteria: Overview and Pictures

Pathogenic mechanisms
In common with most bacteria, shigellae require a range of pathogenic mechanisms to cause disease. They are tolerant to the conditions of low pH encountered in the human stomach and the action of bile.

Pathogenic strains of shigellae, like entero-invasive E. coli, carry a plasmid of 100–140 MDa, which encodes the pathogenic mechanisms involved with eukaryotic cell invasion.

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