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  • Title: Genotypic analysis of plasmid-mediated beta-lactamases amongst Enterobacteriaceae other than Escherichia spp. and Klebsiella spp. that are non-susceptible to a broad-spectrum cephalosporin.
    Author: Kiratisin P, Henprasert A.
    Journal: Int J Antimicrob Agents; 2010 Oct; 36(4):343-7. PubMed ID: 20688485.
    Abstract:
    Enterobacteriaceae other than Escherichia spp. and Klebsiella spp. are recognisable for their increasing resistance. Plasmid-mediated beta-lactamases, including extended-spectrum beta-lactamases (ESBLs), plasmid-mediated AmpC beta-lactamases (pAmpCs) and the newly emerged KPC, play an important role in beta-lactam resistance. In this study, we investigated the genetic characteristics of plasmid-mediated beta-lactamases amongst non-Escherichia, non-Klebsiella Enterobacteriaceae that were non-susceptible to at least a broad-spectrum cephalosporin. A total of 143 (23.9%) of 598 isolates during the 6-month study period met the screening criteria, amongst which 142 (99.3%) and 99 (69.2%) isolates carried ESBL and pAmpC genes, respectively. Resistance genotypes were described. bla(KPC) was not detected in isolates with reduced susceptibility to carbapenems. This study provides an insight into plasmid-mediated resistance determinants amongst cephalosporin-non-susceptible Enterobacteriaceae other than Escherichia spp. and Klebsiella spp.
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