Distribution of extended spectrum β-lactamases-codifying genes in Klebsiella pneumoniae isolates from hospitals of Bogota, D.C., Colombia

Ingrid Yamile Pulido, José Ramón Mantilla, Emilia María Valenzuela, María Teresa Reguero, Elsa Beatriz González, .

Keywords: Klebsiella pneumoniae, beta-lactamases, drug resistance, bacterial, sequence analysis, DNA, molecular epidemiology, Colombia.

Abstract

Introduction. Extended spectrum β-lactamases (ESBL) are the most widely distributed enzymes in Enterobacteriaceae of Latin America and are key enzymes in resistance to antibiotics in common use. However, in Colombia, little information is available concerning the identity of genes coding for these enzymes in Klebsiella pneumoniae.
Objective. The bla genes were identified in K. pneumoniae isolated from hospitals in Bogotá D.C., Colombia.
Materials and methods. One hundred seventy-seven isolates of ESBL producers were collected from 10 hospitals in Bogota between 2003 and 2005. Antibiotic susceptibility was determined by disk diffusion, and the number of β-lactamases in each isolate was assessed by isoelectric focusing. blaCTX-M, blaSHV and blaTEM were identified by PCR and subsequent sequencing.
Results. Besides, the resitenance to third generation cephalosporins, 44.7 % and 49.7 % were resistant to amikacyn and thrimetoprim-sulaphametoxazole respectively. Lower resistance rates to other antibiotics were observed as well. An average of three β-lactamases were detected by isoelectric focusing, and the genes blaCTX-M-12 (56.0%) and blaSHV-12 (33.3%) were the most prevalent. blaSHV-5 (11.8%), blaCTX-M-1 (4.0%), blaSHV-27 (2.8%), blaSHV-2 (2.8%), blaCTX-M-2 (1.7%) and blaCTX-M-15 (0.6%) were present in smaller percentages. In addition, three genes were identified that coded for narrow spectrum β-lactamases.
Conclusion. Eleven bla genes were identified, eight of which were ESBL-coding. The diversity of the bla genes suggested a continuing exposure of K. pneumoniae to strong antibiotic pressures in Bogota hospitals.

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  • Ingrid Yamile Pulido Laboratorio de Epidemiología Molecular, Instituto de Biotecnología, Universidad Nacional de Colombia, Bogotá, D.C., Colombia
  • José Ramón Mantilla Laboratorio de Epidemiología Molecular, Instituto de Biotecnología, Universidad Nacional de Colombia, Bogotá, D.C., Colombia
  • Emilia María Valenzuela Laboratorio de Epidemiología Molecular, Instituto de Biotecnología, Universidad Nacional de Colombia, Bogotá, D.C., Colombia
  • María Teresa Reguero Laboratorio de Epidemiología Molecular, Instituto de Biotecnología, Universidad Nacional de Colombia, Bogotá, D.C., Colombia
  • Elsa Beatriz González Laboratorio de Epidemiología Molecular, Instituto de Biotecnología, Universidad Nacional de Colombia, Bogotá, D.C., Colombia

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How to Cite
1.
Pulido IY, Mantilla JR, Valenzuela EM, Reguero MT, González EB. Distribution of extended spectrum β-lactamases-codifying genes in Klebsiella pneumoniae isolates from hospitals of Bogota, D.C., Colombia. biomedica [Internet]. 2011 Apr. 16 [cited 2024 May 18];31(1):15-20. Available from: https://revistabiomedica.org/index.php/biomedica/article/view/331

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