PRELIMINARY CHARACTERIZATION OF MULTIPLE ANTIBIOTIC
RESISTANT ESCHERICHIA COLI ISOLATED FROM FISH
PROCESSING PLANTS
BRUNDABAN SAHU, A.K. NAYAK, S.D. SINGH, B.K. BEHERA AND GADADHAR DASH
Abstract
Antibiotic resistant E. coli strains isolated during processing of fish were characterised to establish
their level of resistance to different antibiotics and to know whether the genetic resistance mechanism is
mobile in nature. About 80% of the strains were resistant against 4 to 6 antibiotics, while three strains
exhibited resistance against more than ten antibiotics taken for the study. Risk assessment study of the E. coli
strains by Multiple Antibiotic Resistance (MAR) Indexing suggest that the strains have been originated from
high-risk source of contamination. MIC of Vancomycin for the strains was above 100 mg/ml and that of
Ampicillin for above 70% of the strains was above 80 mg/ml. Besides, MIC of 6 antibiotics namely,
Tetracycline, Chloramphenicol, Ampicillin, Vancomycin, Kanamycin and Streptomycin for one particular
strain varied from above 60 μg/ml to above 160 μg/ml. At the same time, MIC level of 4 antibiotics namely,
Tetracycline, Ampicillin, Vancomycin and Streptomycin varied at the similar extent for two other strains.
One of the three strains exhibiting resistance against more than ten antibiotics was found to have lost its
antibiotic resistance property during plasmid curing experiments. This suggests the resistance mechanism
may be plasmid mediated that is mobile in nature and there is every possibility of its transformation to
dreaded pathogen in the environment and create serious menace.
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