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  • Title: Minimum inhibitory concentrations of intestinal Escherichia coli from broiler chickens after oral administration of apramycin.
    Author: Kobe A, Ebrecht A, Fries R.
    Journal: J Appl Bacteriol; 1996 Jan; 80(1):26-30. PubMed ID: 8698650.
    Abstract:
    This study describes the influence of apramycin on minimum inhibitory concentrations (MIC) of intestinal Escherichia coli in young broiler chickens, after oral administration of the antibiotic at a dosage equivalent to a prophylactic course of treatment for 10 d. The bacteria were isolated from cloacal swabs and caecal contents. MICs were determined by agar dilution procedures. MIC of apramycin for the investigated strains ranged from 1 microgram ml-1 to 16 micrograms ml-1. Strains obtained from undosed birds mainly had MIC values of 2 micrograms ml-1. MIC values of 8 micrograms ml-1 or more were recorded only among isolates obtained from chickens which had received apramycin. Administration of apramycin resulted in a slight but statistically significant increase in the average MIC. Statistically higher average MICs were recorded among isolates from cloacal swabs 10 d after withdrawal until the end of the experiment. For strains from caecal contents, this was demonstrated only on one sampling occasion, 15 d after withdrawal.
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