FIG. 2.
The B. bronchiseptica Δwlb mutant is defective in tracheal and lung colonization in BALB/c mice. Groups of 4-week-old female mice were inoculated with 5 × 105 CFU of either wt B. bronchiseptica or its Δwlb derivative delivered in a 50-μl volume of PBS into the nares. Data points are presented as mean log10 CFU and standard error. P values are shown where P < 0.02.