Fig. 4.

Independent challenges of female BALB/c mice with E. coli strain NU149 (WT, ⧫), an ompR mutant (NU149 OmpR1, □), an ompR mutant strain complemented with the native ompR gene (NU149 OmpR1/pFR29*, ▴), and an ompR mutant strain complemented with a mutated ompR gene (NU149 OmpR1/pD55A, ○). Bacterial counts are shown for: (a) the bladder, 1 day post-inoculation; (b) the kidney, 1 day post-inoculation; (c) the bladder, 3 days post-inoculation; (d) the kidney, 3 days post-inoculation; (e) the bladder, 5 days post-inoculation; and (f) the kidney, 5 days post-inoculation. Each data point represents the c.f.u. ml⁻¹ for one mouse. Horizontal bars represent the median values of the bacterial concentration of the population.