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In Vitro Susceptibility of Escherichia coli Strains Isolated from Diarrhoeic Dairy Calves to 15 Antimicrobial Agents
In Vitro Susceptibility of Escherichia coli Strains Isolated from Diarrhoeic Dairy Calves to 15 Antimicrobial Agents
- Source :
- Journal of Veterinary Medicine Series B. 47:329-335
- Publication Year :
- 2000
- Publisher :
- Wiley, 2000.
-
Abstract
- The in vitro activities of 15 antimicrobial agents against 195 strains of Escherichia coli isolated from dairy calves affected by neonatal diarrhoea were determined. Of these strains 137 produced one or more potential virulence factors (F5, F41, F17, cytotoxic necrotizing factor, verotoxin and the eae gene), but the remaining 58 strains did not produce any of these factors. The overall percentage of resistant strains to streptomycin, tylosin and tetracycline was very high (above 65%). A high level of resistance (from 23 to 50%) to ampicillin, neomycin, kanamycin, spectinomycin, chloramphenicol, sulphadimethoxine and trimethoprim was also detected. The E. coli strains were very susceptible (89-95%) to apramycin and gentamicin and highly susceptible (99-100%) to polymyxin B, florfenicol and nitrofurazone. Some significant differences (P < 0.05) in the frequencies of resistance to some of the antimicrobials tested and in the rates of multi-drug resistance among the strains producing potential virulence factors and non-fimbriated, non-toxigenic, eae-negative strains were found. Most of the strains showed multi-resistance: 76.9% of the isolates were resistant to at least two antibiotics, 67.7% were resistant to at least four antibiotics and 50.3% were resistant to at least six antibiotics.
- Subjects :
- Diarrhea
medicine.drug_class
Tetracycline
Antibiotics
Cattle Diseases
Virulence
Microbial Sensitivity Tests
Drug resistance
Biology
Apramycin
medicine.disease_cause
Microbiology
Ampicillin
Escherichia coli
medicine
Animals
Escherichia coli Infections
Drug Resistance, Microbial
General Medicine
Antimicrobial
Virology
Anti-Bacterial Agents
Dairying
Animals, Newborn
Cattle
medicine.drug
Subjects
Details
- ISSN :
- 14390450 and 09311793
- Volume :
- 47
- Database :
- OpenAIRE
- Journal :
- Journal of Veterinary Medicine Series B
- Accession number :
- edsair.doi.dedup.....9fdc28bb9df7f061f4707a7b4662545f
- Full Text :
- https://doi.org/10.1046/j.1439-0450.2000.00356.x