FIG. 6.

Heptoseless B. cenocepacia is sensitive to polymyxin B. (A) Number of CFU prior to challenge (Starting CFU) and 2 h after incubation in the absence (Buffer) or presence (Polymyxin B) of 100 μg/ml polymyxin B. (B) Time course analysis of growth in the absence (solid symbols) or presence (open symbols) of 100 μg/ml polymyxin B for 4.5 h. The data points and error bars indicate means and standard deviations of data from one representative experiment done in triplicate. Significant differences were determined using unpaired t tests. One asterisk indicates that the P value is <0.05 for the statistical difference between the polymyxin B and buffer treatments, and two asterisks indicate that the P value is <0.001.