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Persistence of E. coli VR50, VR50pheV-GI, VR50afa, and VR50afaE in the bladders of C57BL/6 mice 18 h after intraurethral challenge. The results represent log10 CFU/0.1 g bladder tissue of individual mice, and the horizontal bars mark group medians. A minimum of 8 mice were assessed per group. E. coli VR50 was recovered from the bladders of infected mice in significantly higher numbers than each of the mutant strains (P = 0.002; Kruskal-Wallis test).
