Characterization of Fluoroquinolone Resistance among Veterinary Isolates of Avian Escherichia coli

ABSTRACT

Fluoroquinolone-resistant avian Escherichia coliisolates from northern Georgia were investigated for gyrAand parC mutations. All isolates contained a mutation in GyrA replacing Ser83 with Leu; seven isolates also contained mutations replacing Asp87 with either Gly or Tyr. Random amplified polymorphic DNA analysis revealed that quinolone-resistant E. coliisolates were genetically diverse.