Occurrence of IncFII plasmids carrying the bla(CTX-M-15) gene in Salmonella enterica serovar Enteritidis sequence type 11 in Korea.

A total of 49 consecutive nonduplicate Salmonella isolates collected in a nationwide survey performed in 2009 in Korea were included in this study. Resistance gene, sizes, and replicon sequence types (RSTs) of R plasmids, and sequence types (STs) and XbaI-macrorestriction patterns of extended-spectrum β-lactamase (ESBL)-producing isolates were determined. Six Salmonella enterica serovar Enteritidis isolates of ST11 showed ESBL phenotypes, and the isolates harbored an incompatibility group FII plasmid of RST S1:A-:B- carrying the bla(CTX-M-15) gene.