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Antimicrobial Agents and Chemotherapy, October 2000, p. 2897-2899, Vol. 44, No. 10
0066-4804/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Characterization of Fluoroquinolone Resistance among Veterinary Isolates of Avian Escherichia coli

David G. White,1,2,* Laura J. V. Piddock,3 John J. Maurer,4 Shaohua Zhao,2 Vito Ricci,3 and Stephan G. Thayer4

Department of Veterinary and Microbiological Sciences, North Dakota State University, Fargo, North Dakota1; Division of Immunity and Infection, University of Birmingham, Birmingham, United Kingdom3; Department of Avian Medicine, University of Georgia, Athens, Georgia4; and Division of Animal and Food Microbiology, Center for Veterinary Medicine, U.S. Food and Drug Administration, Laurel, Maryland2

Received 6 April 2000/Returned for modification 21 June 2000/Accepted 10 July 2000

Fluoroquinolone-resistant avian Escherichia coli isolates from northern Georgia were investigated for gyrA and 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. coli isolates were genetically diverse.

* Corresponding author. Mailing address: Office of Research, Center for Veterinary Medicine, U.S. Food and Drug Administration, Laurel, MD 20708. Phone: (301) 827-8037. Fax: (301) 827-8127. E-mail: dwhite{at}cvm.fda.gov.

Antimicrobial Agents and Chemotherapy, October 2000, p. 2897-2899, Vol. 44, No. 10
0066-4804/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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