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Comparison of percentages of ampicillin-resistant (AMP) and chlortetracycline-resistant (CTC) fecal coliform isolates from human (Wastewater) and cattle (Cow) sources. The concentrations (conc) of ampicillin were as follows: conc1, 10 μg/ml; conc2, 15 μg/ml; conc3, 30 μg/ml; and conc4, 50 μg/ml. The concentrations of chlortetracycline were as follows: conc1, 20 μg/ml; conc2, 40 μg/ml; conc3, 60 μg/ml; and conc4, 80 μg/ml.
