Molecular characterization of an outbreak caused by CTX-M-12-producing Klebsiella pneumoniae in a Colombian hospital´s neonatal intensive care unit

José Ramón Mantilla, María Teresa Reguero, Elsa Beatriz González, Ibonne Ayde García, Aura Lucía Leal, Paula Andrea Espinal, Celia Alpuche, Ismael Alberto Valderrama, Martha Isabel Garzón, Narda María Olarte, .

Keywords: Klebsiella pneumoniae, beta-Lactamases, Cross Infection, Drug Resistance, Cephalosporins, Bacterial Typing Techniques

Abstract

Introduction. Molecular characterisation of Klebsiella pneumoniae strains is a tool that assits in the reduction of the disemination of drug resistance and the control of nosocomial infections that are caused by this pathogen.
Objective. Molecular description of an outbreak of nosocomial infection caused by Klebsiella pneumoniae in a neonatal intensive care unit in a tertiary level hospital in Bogotá.
Methods: Eleven Klebsiella pneumoniae isolates were analysed. Production of Extended Spectrum Beta-Lactamases was verified by agar diffusion tests. Isoelectric points of the enzymes were determined by isoelectric focusing. The blaCTX-M-12 gene was detected by PCR and pulsed field gel electrophoresis genotyping was done.
Results. All the isolates were Extended Spectrum Beta-Lactamase producers. Pulsed field gel electrophoresis and BOX-PCR genotyping grouped two isolates from hospital objects and eight infection-causing isolates into a single epidemic clone. The isolate from a thermometer was not grouped into the epidemic clone and showed a different resistance pattern. Isoelectric focusing revealed simultaneous beta-lactamase production having different isoelectric points. PCR amplification revealed the presence of the blaCTX-M-12 gene in the 11 isolates studied.
Conclusion. This is the first report of a molecularly characterised outbreak of CTX-M-12-producing Klebsiella pneumoniae from Colombia. The results of this study provide additional evidence of the global dissemination of CTX-M ESBL and the need for epidemiological follow-up in our hospitals.

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  • José Ramón Mantilla Grupo de Epidemiología Molecular, Instituto de Biotecnología, Universidad Nacional de Colombia, Bogotá D.C., Colombia.
  • María Teresa Reguero Grupo de Epidemiología Molecular, Instituto de Biotecnología, Universidad Nacional de Colombia, Bogotá D.C., Colombia.
  • Elsa Beatriz González Grupo de Epidemiología Molecular, Instituto de Biotecnología, Universidad Nacional de Colombia, Bogotá D.C., Colombia.
  • Ibonne Ayde García Grupo de Epidemiología Molecular, Instituto de Biotecnología, Universidad Nacional de Colombia, Bogotá D.C., Colombia.
  • Aura Lucía Leal Departamento de Microbiología, Facultad de Medicina, Universidad Nacional de Colombia, Bogotá D.C., Colombia.
  • Paula Andrea Espinal
  • Celia Alpuche Facultad de Medicina, Universidad Nacional Autónoma de México, México D. F., México.
  • Ismael Alberto Valderrama Empresa Social del Estado (ESE) Hospital El Tunal, Bogotá D.C., Colombia.
  • Martha Isabel Garzón Empresa Social del Estado (ESE) Hospital El Tunal, Bogotá D.C., Colombia.
  • Narda María Olarte Empresa Social del Estado (ESE) Hospital El Tunal, Bogotá D.C., Colombia.

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How to Cite
1.
Mantilla JR, Reguero MT, González EB, García IA, Leal AL, Espinal PA, et al. Molecular characterization of an outbreak caused by CTX-M-12-producing Klebsiella pneumoniae in a Colombian hospital´s neonatal intensive care unit. biomedica [Internet]. 2006 Sep. 1 [cited 2024 May 17];26(3):408-14. Available from: https://revistabiomedica.org/index.php/biomedica/article/view/359

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