Gut Instinct: Salmonella Bacteria's Molecular Tactics To Cause Illness

Hundreds of trillions of bacteria make their home in the vertebrate gut. Though many of these microbes perform helpful duties for their host, others -- the pathogens -- are unwelcome visitors, causing disease. New research unveils a key survival circuit, which activates a signaling cascade, switching on or off a suite of genes necessary to circumvent the body's multiple defense mechanisms and cause illness.

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