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Concentration of Y. pestis in organs before treatment was initiated. Bacterial counts (CFU/g of tissue or CFU/ml) were determined in panels of organs at 24 or 38 h postchallenge. (A) Five mice were challenged and euthanized at 24 h postchallenge. (B) Five mice were challenged and euthanized at 38 h postchallenge. LoD, limit of detection.
