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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 CLR (4 μg/ml) alone or CLR (4 μg/ml) in combination with either EMB (B, 1 μg/ml; C, 2 μg/ml; D, 4 μg/ml; E, 8 μg/ml) or RBT (F, 0.0125 μg/ml; G, 0.025 μg/ml; H, 0.05 μg/ml; I, 0.1 μg/ml). Conditions that resulted in significantly lower numbers of CLRr organisms compared to the numbers in cultures containing CLR alone are indicated (∗, P < 0.05).
