Abstract
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 (≥4 mg/L) and ENR (≥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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Abbreviations
- AMP:
-
ampicillin
- CIP:
-
ciprofloxacin
- CMP:
-
chloramphenicol
- COT:
-
cotrimoxazol
- ENR:
-
enrofloxacin
- GEN:
-
gentamicin
- NEO:
-
neomycin
- SPE:
-
spectinomycin
- STM:
-
streptomycin
- TTC:
-
tetracycline
- Asn:
-
asparagine
- Asp:
-
aspartic acid
- Ile:
-
isoleucine Ser serine
- Leu:
-
leucine
- Ser:
-
serine
- Tyr:
-
tyrosine
- CLSI:
-
Clinical Laboratory Standards Institute
- ESBL(s):
-
extended spectrum β-lactamase(s)
- MICxG:
-
geometric mean of MIC
- PMQR:
-
plasmid mediated quinolone resistance
- QRDR:
-
quinolone-resistance determining region
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Kmeť, V., Kmeťová, M. High level of quinolone resistance in Escherichia coli from healthy chicken broilers. Folia Microbiol 55, 79–82 (2010). https://doi.org/10.1007/s12223-010-0013-x
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DOI: https://doi.org/10.1007/s12223-010-0013-x