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Journal of Antimicrobial Chemotherapy (2001) 47, 341-343
© 2001 The British Society for Antimicrobial Chemotherapy

Brief report

Characterization of high-level fluoroquinolone resistance in Escherichia coli O78:K80 isolated from turkeys

Etienne Giraud, Sabine Leroy-Sétrin, Géraldine Flaujac, Axel Cloeckaert, Maryvonne Dho-Moulin and Elisabeth Chaslus-Dancla,*

Station de Pathologie Aviaire et de Parasitologie, Institut National de la Recherche Agronomique, Centre de Recherche de Tours-Nouzilly, 37380 Monnaie, France

Fluoroquinolone resistance was characterized in Escherichia coli O78:K80 isolated from diseased turkeys. The level of resistance to fluoroquinolones of the isolates appeared closely correlated with substitutions in GyrA and ParC, but not with the production of the AcrAB efflux pump. Among isolates highly resistant to ciprofloxacin (MIC 8 mg/L) and harbouring identical substitutions (two in GyrA and one in ParC), two close but distinguishable ribotypes were identified. This indicated that at least two independent selection events may have occurred.

* Corresponding author. Tel: +33-2-47-42-77-65; Fax: +33-2-47-42-77-74; E-mail: chaslus{at}tours.inra.fr


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