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Evaluation of SBA incubation times for S. flexneri 2a. The numbers of surviving S. flexneri 2a colonies (y axis) after incubating with serially diluted MAb Hflex2a1 (solid diamonds) or human serum pool 007sp (open circles) (x axis) are shown at various time points. Dashed horizontal line indicates 50% killing. CFU counts obtained with control wells were used as 0% killing.
