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Small intestine colonization competition assays in infant mice with O139 strain VC4251dlacZ and mshA, gbpA, and tcpA deletion mutants from strain VC4251. The competition indexes were measured in the small intestines of infant mice; the y axis represents the log values of the competition index (mutant/VC4251dlacZ). The bars represent competition pairs of strain VC4251dlacZ and the mutants.
