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Total numbers of CFU per milliliter (■) and numbers of CLRr CFU per milliliter (bars) after 4 days of culture in the presence of AZM (32 to 512 μg/ml) and CLR (4 and 64 μg/ml). For each strain, conditions that resulted in significantly lower numbers of CLRr organisms compared to the numbers in cultures containing 4 μg of CLR per ml are indicated (∗, P < 0.05; ∗∗, P < 0.01).
