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CHARACTERISATION OF THE ANTIMICROBIAL BEHAVIOUR OF ESCHERICHIA COLI AND SALMONELLA SPP. STRAINS ISOLATED FROM PIGS IN THE WESTERN PART OF ROMANIA
Abstract
The present study investigated the antimicrobial behaviour of E. coli and Salmonella spp. strains, isolated from pigs after their weaning age. Antimicrobial testing susceptibility by the Kirby-Bauer method allowed the identification of bacterial strains with multiple antibiotic resistance (58.02% for E. coli isolated strains and 47.27% for Salmonella isolated strains). Thus, it was noted that all 54 strains of E. coli showed resistance to trimethoprim; sulfathiazole with sulfacetamide and sulfabenzamide; sulphametoxazol with trimethoprim; ciprofloxacin and nalidixic acid; more than 95% of the strains were resistant to streptomycin, ampicillin and kanamycin. Over 60% of Salmonella spp. strains were resistant to lincomycin, streptomycin, tetracycline, and flumequine. The lowest bactericidal activity was attributed to lincomycin, 90.90% of the Salmonella isolates being reistant to this antimicrobial. Regarding the sensitivity of E. coli isolated strains, over 85% showed sensitivity to ceftazidime, aztreonam and imipenem. Between 50% - 60% of Salmonella strains were sensitive to gentamicin, cefotaxime, and amikacin, while less than 50% of the isolates were susceptible to the rest of the studied antibiotics.
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