Regulated Virulence Controls the Ability of a Pathogen to Compete with the Gut Microbiota

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Abstract
Establishing an Enteric Infection: Complex and highly regulated interactions are required to keep the peace between the bacteria that reside in our gut and the immune system. How do pathogenic bacteria, such as the strains of Escherichia coli that cause gastroenteritis, get a foothold to establish an infection, and what is the role of resident bacteria in this process? Kamada et al. (p. 1325 , published online 10 May; see the Perspective by Sperandio ) infected mice orally with Citrobacter rodentium and found that mice with normal commensal microflora, which were better able to contain the infection than mice that lacked the commensals, which were not able to clear the infection.

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