A Two-Year Surveillance in Five Colombian Tertiary Care Hospitals Reveals High Frequency of Non-CG258 Clones of Carbapenem-Resistant Klebsiella pneumoniae with Distinct Clinical Characteristics

Antimicrobial Agents and Chemotherapy
Ana M OcampoJ N Jiménez

Abstract

The global spread of carbapenem-resistant Klebsiella pneumoniae (CR-Kp) has been largely associated with sequence type 258 (ST258) and its related variants (clonal group 258 [CG258]). Here we describe the molecular epidemiology of CR-Kp from five tertiary care hospitals in Medellín, the second largest city in Colombia. All CR-Kp-infected patients admitted from June 2012 to June 2014 were included (n = 193). Patients' clinical information was obtained from medical records. Carbapenemase KPC, VIM, IMP, NDM, and OXA-48 genes were detected by PCR. A CG258-tonB79 cluster-specific real-time PCR (targeting the multilocus sequence type [MLST] tonB79 allele), pulsed-field gel electrophoresis (PFGE), and MLST analysis were performed for typing. Remarkably, 62.2% (n = 120) of isolates were from STs unrelated to CG258 (non-CG258). KPC-3 predominated in CG258 isolates (86.3%), while KPC-2 prevailed in non-CG258 isolates (75.5%) (P < 0.001). Multidrug resistance (MDR) frequency was significantly higher in CG258 strains (91.4% versus 56.1%; P < 0.001). ST512 (a single-locus variant of ST258) is the main ST in CG258 (96.3%), and isolates in this group showed closely related pulsotype and similar resistance gene profiles, suggesting the clonal ...Continue Reading

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