FIG. 6.
Attenuated intestinal colonization by an EHEC etk mutant. Infant rabbits were coinfected with EDL933 Nalr and an isogenic etk::kan mutant (SK2472). At days 2 (A) and 7 (B) postinfection, CI values were determined. Each point represents an animal, and the bars represent the geometric mean. Open symbols represent animals in which no etk mutant CFU was recovered from the lowest dilution; the results were adjusted to represent the recovery of 1 CFU at that dilution. The data were compared to a theoretical CI of 1 with the Wilcoxon signed rank test, and the P values obtained are shown. Nonsignificant results are marked as NS.