Immotile, gram-negative bacilliAcid-resistant (a low inoculum is required to cause infection)Form green colonies on Hektoen enteric agar (HE) (differentiating them from Salmonella spp., which form black colonies on HE)Invades M cells in Peyer’s patches of the gastrointestinal mucosa (where they induce host cell apoptosis and manipulate actin filaments of the eukaryotic cytoskeleton to achieve intracellular motility)Mnipulate the eukaryotic cytoskeleton (primarily actin filaments) to achieve intracellular motility after invading M cells in Peyer’s patches of the gastrointestinal mucosa

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