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Survival of B. pertussis in complement. BP338 and BPM2041 were incubated with 10% human serum for 15 (P < 0.0038) or 120 (P < 0.0012) min. Percent survival is calculated relative to a non-killing heat-inactivated serum control. The results are the average and standard error of four separate trials. BPM2041 is the BrkA mutant; BP338 is the wild type.
