FIG. 3.

Kinetics of appearance of nonmotile E. coli MG1655 (+IS1) in the mouse intestine. Forty-two mice were fed 10⁵ CFU of wild-type E. coli MG1655 (+IS1). At the indicated times, 50 colonies isolated from the feces of each mouse were tested for motility (□) as described in Materials and Methods; the error bars represent the standard deviations of the means for the percentage of nonmotile E. coli MG1655 (+IS1). ▪, log₁₀ mean E. coli MG1655 (+IS1) CFU per gram of feces for 42 mice (the error bars represent the standard errors of the log₁₀ means).