Prevalence of CTX-M-15 Extended-Spectrum β-Lactamase–Producing Salmonella Isolated from Chicken in Korea

Abstract A total of 162 Salmonella isolates were isolated in samples from poultry farms, slaughterhouses, retail chicken meats, and human feces between 2012 and 2013. All extended-spectrum β-lactamase–producing isolates had blaCTX-M-15 gene sequence in their plasmids. This genotype may be related to multidrug resistance. Repetitive sequence-based polymerase chain reaction patterns among CTX-M-15 isolates were classified into 12 indistinguishable groups. CTX-M-15 isolates had various plasmid replicon types; however, the most frequent type was FIIS. This result suggests that blaCTX-M-15 could be propagated via plasmid transfer.