JAC Advance Access originally published online on February 25, 2003
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Journal of Antimicrobial Chemotherapy (2003) 51, 1007-1009
© 2003 The British Society for Antimicrobial Chemotherapy
Florfenicol resistance in Salmonella enterica serovar Newport mediated by a plasmid related to R55 from Klebsiella pneumoniae
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
Received 11 March 2002; returned 6 June 2002; revised 26 June 2002; accepted 7 January 2003
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.
* Corresponding author. Tel: +33-2-47-42-77-50; Fax: +33-2-47-42-77-74; E-mail: cloeckae{at}tours.inra.fr
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