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JAC Advance Access published online on February 25, 2003
Journal of Antimicrobial Chemotherapy, doi:10.1093/jac/dkg141
© 2003 by The British Society for Antimicrobial Chemotherapy
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© 2003 The British Society for Antimicrobial Chemotherapy

Brief report

Florfenicol resistance in Salmonella enterica serovar Newport mediated by a plasmid related to R55 from Klebsiella pneumoniae

Danièle Meunier 1, Sylvie Baucheron 1, Elisabeth Chaslus-Dancla 1, Jean-Louis Martel 2, Axel Cloeckaert 1*

1 Unité de Pathologie Aviaire et Parasitologie, Institut National de la Recherche Agronomique, 37380 Nouzilly
2 Agence Française de Sécurité Sanitaire des Aliments, 69007 Lyon, France

* Corresponding author. E-mail: cloeckae{at}tours.inra.fr.

Received 11 March 2002 ; revised 6 June 2002 ; accepted 7 January 2003

Abstract

Florfenicol resistance has emerged over the past few years in multidrug-resistant Salmonella enterica serovars Typhimurium, Agona and Paratyphi B. The floR gene encoding florfenicol resistance is chromosomally located in these serovars within a genomic island of 43 kb called SGI1 (Salmonella genomic island 1). In the present study, we characterized florfenicol resistance in a strain of S. enterica serovar Newport isolated from a turkey in 1990 and that lacked SGI1. Florfenicol resistance was mediated by a conjugative plasmid related to R55 from Klebsiella pneumoniae, which was characterized initially in the 1970s and harbours a gene 95% identical to floR.


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