A cluster of KPC-2 and VIM-2-producing Klebsiella pneumoniae ST833 isolates from the pediatric service of a Venezuelan Hospital

BACKGROUND: Klebsiella pneumoniae is a bacterial pathogen that has developed resistance to multiple antibiotics and is a major cause of nosocomial infections worldwide. Carbapenemase-producing Klebsiella pneumoniae have been isolated in many hospitals in Venezuela, but they have not been well-studied. The aim of this study was to characterize carbapenem-resistant Klebsiella pneumoniae isolates from the pediatric service of a hospital located in Anzoategui State, in the eastern part of Venezuela. METHODS: Nineteen Klebsiella pneumoniae strains isolated in the hospital from April to July 2014 were evaluated phenotypically and molecularly for the presence of carbapenemases blaKPC, blaIMP and blaVIM. Molecular epidemiology was performed with Repetitive Extragenic Palindromic-PCR (REP-PCR) and Multilocus Sequence Typing (MLST). They were also studied for phenotypic and molecular resistance to a quaternary ammonium compound (QAC) disinfectant. RESULTS: All 19 isolates contained both bla (VIM-2) and bla (KPC-2) genes, and the bla (KPC-2) gene was associated with Tn4401b. All isolates were phenotypically sensitive to QACs and contained qacΔE and addA2 genes typical of class 1 integrons. Analysis by REP-PCR and MLST showed that all isolates had identical profiles characteristic of sequence type ST833. CONCLUSION: All 19 strains are bla (VIM-2) and bla (KPC)-(2−)producing ST833 K. pneumoniae sensitive to QACs. This analysis may help to understand the routes of dissemination and confirms that QAC disinfectants can be used to help control their spread. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1186/s12879-016-1927-y) contains supplementary material, which is available to authorized users.