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Susceptibility of B. abortus 2308 or RB51 or the virB mutant to complement-antibody-mediated killing. Bacteria were treated with fresh or heat-inactivated complement and naïve serum, and CFU were subsequently determined. Bars represent the mean ± standard deviation of a single experiment that was representative of duplicate experiments performed. The asterisk denotes a statistically significant difference (P < 0.05) determined with the Student t test.
