FIG. 3.

Correlation between in vitro growth curves for B. pertussis (Bp) 12743 and ΔbscN B. pertussis 12743. B. pertussis 12743 and ΔbscN B. pertussis 12743 were cultured for 2 days in SS medium, and samples were removed at the indicated time points. (A) OD₆₀₀ was determined. (B) The number of viable bacteria was determined by performing CFU counts after plating on BG agar. (C) CFU counts were plotted against OD₆₀₀ for each strain separately, and linear regression analysis was performed. The correlation (r value) and level of significance (P value) are shown.