High level of quinolone resistance in Escherichia coli from healthy chicken broilers
Language English Country United States Media print-electronic
Document type Journal Article, Research Support, Non-U.S. Gov't
- MeSH
- Anti-Bacterial Agents pharmacology MeSH
- Chromosomes, Bacterial MeSH
- Drug Resistance, Bacterial * MeSH
- Quinolones pharmacology MeSH
- DNA Gyrase genetics MeSH
- DNA Topoisomerase IV genetics MeSH
- Escherichia coli drug effects isolation & purification MeSH
- Chickens microbiology MeSH
- Microbial Sensitivity Tests MeSH
- Mutation, Missense MeSH
- Molecular Sequence Data MeSH
- Plasmids MeSH
- Escherichia coli Proteins genetics MeSH
- Amino Acid Sequence MeSH
- Amino Acid Substitution MeSH
- Animals MeSH
- Check Tag
- Animals MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Names of Substances
- Anti-Bacterial Agents MeSH
- Quinolones MeSH
- DNA Gyrase MeSH
- DNA Topoisomerase IV MeSH
- Escherichia coli Proteins MeSH
The development of resistance to quinolones (nalidixic acid, ciprofloxacin and enrofloxacin) in 2006-2008 was evaluated in 317 strains of Escherichia coli isolated from healthy chicken broilers from various farms. The isolates (2006/2007/2008) showed a high resistance to nalidixic acid (87/85/67 %), ciprofloxacin (CIP) (49/54/29 %) and enrofloxacin (ENR) (52/42/22 %). Nalidixic acid-resistant isolates with low level of MIC for CIP and ENR represented a single mutation; intermediary MIC for CIP and ENR were related to two mutations and high level resistance MIC for CIP (> or =4 mg/L) and ENR (> or =16 mg/L) represented three mutations (two in gyrA and one in parC). There was a correlation between the phenotype reading of high-level resistance and mutations in gyrA (Ser83Leu, Asp87Tyr or Asp87Asn) and parC (Ser80Ile) gene. Plasmid-mediated quinolone-resistance qnrS gene was detected in one Escherichia coli strain with a high level of ciprofloxacin resistance. Our results demonstrate the increase in occurrence of multiresistant E. coli strains with a high level of chromosomal and plasmid resistance to fluoroquinolones.
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