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Bactericidal activities of three mouse serum samples in an fSBA with active complement (closed symbols) and inactive complement (open symbols) against target strain 2996. fSBA BC50 titers (in parentheses) are expressed as the reciprocal of the highest dilution of antiserum that yields AFUs greater than or equal to the AFUs obtained in reaction wells with 50% target cells incubated with normal mouse serum (the line marked CFU50, which indicates ∼15,500 AFU).
