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Molecular and genetic characterization of carbapenemase-producing bacteria in Venezuela

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journal contribution
posted on 2019-05-03, 06:42 authored by Liliana Gomez-Gamboa, Humberto Barrios-Camacho, Josefina Duran-Bedolla, Alejandro Sánchez-Perez, Fernando Reyna-Flores, Armindo Perozo-Mena, Irene Zabala, Nadia Rodriguez-Medina, Jesús Martínez-Barnetche, Juan Téllez-Sosa, Humberto Valdovinos-Torres, Ulises Garza-Ramos

Carbapenem-resistant Gram-negative bacteria isolated in Venezuela have been poorly characterized. The present study characterized a total of 34 isolates obtained from 27 patients; five of these patients were multi-infected. The bacterial species identified were Klebsiella pneumoniae (17), Pseudomonas aeruginosa (9), and Acinetobacter baumannii (8). From these isolates, 85% were identified as carbapenemase-producing bacteria, and the identified carbapenemase genes were blaKPC-2 (10/29 [34.4%]), blaVIM-type (7/29 [24.1%]), blaOXA-23 (7/29 [24.1%]), blaNDM-1 (8/29 [27.5%]), and the coexistence of blaOXA-23/blaNDM-1 (2/29 [6.8%]). Patient 1 was multi-infected by K. pneumoniae ST11 and ST2413 isolates harbouring the blaNDM-1 and blaKPC-2 genes, respectively. The other patients were multi-infected by two or three different bacterial species such as ESBL-producing K. pneumoniae isolates, P. aeruginosa harbouring the blaVIM-type gene, K. pneumoniae ST147 harbouring the blaKPC-2 gene and by A. baumannii harbouring the blaOXA-23 gene. The blaNDM-1 gene in A. baumannii is flanked by an uncommon genetic structure, whereas blaNDM-1 gene in K. pneumoniae revealed a common structure described in different plasmids from Enterobacteriaceae isolates. This study provides new information about the epidemiology of carbapenemase-producing bacteria in clinical setting in Venezuela.

Funding

This work was supported by CONACYT (Consejo Nacional de Ciencia y Tecnología) of Mexico, with the grant number CB2015-256988.

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