2005•Journal of Clinical MicrobiologyOpen access

Prevalence of Derepressed AmpC Mutants and Extended-Spectrum β-Lactamase Producers among Clinical Isolates of Citrobacter freundii , Enterobacter spp., and Serratia marcescens in Korea: Dissemination of CTX-M-3, TEM-52, and SHV-12

Jung Min Kim, Yu-Mi Lim

Abstract

The resistance mechanism of extended-spectrum cephalosporins in clinical isolates of Citrobacter freundii, Enterobacter spp., and Serratia marcescens was studied. Of 152 isolates, 45 isolates (29.6%) were derepressed AmpC mutants and 39 isolates (25.7%) produced extended-spectrum beta-lactamase (ESBLs). The most prevalent ESBLs were CTX-M enzymes, followed by TEM-52 and SHV-12.

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Key concepts: Citrobacter freundii, Serratia marcescens, Citrobacter, Enterobacter, Microbiology, Serratia, Biology, Cephalosporin