Investigation of the presence of extended spectrum beta-lactamases (ESBL) in multiresistant strains of E. [Escherichia] coli and Salmonella species originated from domestic animals
2007
Filipovic, I., Specialistic Veterinary Laboratory, Podgorica (Montenegro) | Misic, D., Faculty of Veterinary Medicine, Belgrade (Serbia) | Asanin, R., Faculty of Veterinary Medicine, Belgrade (Serbia)
The investigation of the ESBL presence was completed on multiresistant E. coli and Salmonella strains originating from dogs, cats, cattle, sheep, goats, pigs and poultry. The sum of 112 E. coli and 45 Salmonella strains was investigated. All strains resistant to 3 or more antibiotics were categorized as multiresistant, which led to a conclusion that 35 E. coli and 6 Salmonella strains out of all investigated were multiresistant to antibiotics. The largest number of multiresistant E. coli was discovered in cattle - 12 in total, and the minimal number in goats and sheep, with two strains each. All multiresistant Salmonella strains belonged to the Salmonella Enteritidis species (S. enterica subsp. enterica serovar Enteritidis). The sum of multiresistant Salmonella strains compared to all investigated strains was relatively low (13.3%), but the resistance prevalence for some antibiotics in these strains was extremely high, for ampicillin and amoxicillin with clavulanic acid as high as 100%, and for tetracycline 83.3%. For the control in this investigation were used ESBL positive E. coli strains originated in human urine specimens. No presence of positive ESBL strains was established. However, when the screening investigation was performed, almost all the strains were suspect, thus a confirmatory test had to be performed for all strains.
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