FIG. 1.

Lung colonization by B. pertussis. OF1 mice were infected i.n. with B. pertussis BPSM (black squares) or BPRA (open circles) (A) or BPGR4 (open squares) or BPDR (black circles) (B). At the indicated time points, the mice were sacrificed, and the CFU present in the lungs were counted. Each curve represents an average of independent experiments. The results are expressed as the means ± the standard errors of the means. Four mice per time point and per group were assessed for each experiment.