FIG 7.

Roles of RyhB and Fur in expression of siderophore genes in infected bladders of mice. Expression of genes for the mutant strains in infected bladders at 48 h p.i. (A) and 6 h p.i. (B) was compared to that of the wild-type CFT073 strain. The dashed lines correspond to the cutoffs for a significant difference in expression. Results are the mean values and standard deviations of results for five bladders infected with each strain. Statistical significance was calculated by the Student t test (*, P < 0.05; **, P < 0.005). #, these genes were detected in 3/5 bladders infected with the ΔryhB and ΔryhB Δfur mutants.