A double mutation in the gyrA gene is necessary to produce high levels of resistance to moxifloxacin in Campylobacter spp. clinical isolates

Int J Antimicrob Agents. 2005 Jun;25(6):542-5. doi: 10.1016/j.ijantimicag.2004.10.016.


The aim of this study was to compare different fluoroquinolones against Campylobacter spp., analysing the molecular mechanisms of resistance. Moxifloxacin exhibited the greatest activity of the quinolones tested, being active against isolates carrying a single mutation in the gyrA gene. High resistance levels to moxifloxacin were related to the presence of a double gyrA mutation.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amino Acid Substitution / genetics
  • Anti-Bacterial Agents / pharmacology*
  • Aza Compounds / pharmacology*
  • Campylobacter / drug effects*
  • Campylobacter / genetics
  • DNA Gyrase / drug effects
  • DNA Gyrase / genetics*
  • Drug Resistance, Bacterial / genetics*
  • Feces / microbiology
  • Fluoroquinolones
  • Humans
  • Microbial Sensitivity Tests
  • Moxifloxacin
  • Mutation*
  • Quinolines / pharmacology*


  • Anti-Bacterial Agents
  • Aza Compounds
  • Fluoroquinolones
  • Quinolines
  • DNA Gyrase
  • Moxifloxacin