Abstract

Klebsiella pneumoniae is the second most prevalent gram-negative rod that causes nosocomial infections in hospitalized or otherwise immunocompromised patients. It can develop multiple drug resistance that results in limited treatment options and increased use of carbapenems. Various mechanisms are related to the development of carbapenem resistance in K. pneumoniae. The aim of this study was to perform phenotypic and molecular characterization of clinical isolates of carbapenemase-producing K. pneumoniae from two outbreaks recorded in 2017 and 2018 in Clinical Center University of Sarajevo, Bosnia and Herzegovina. Identification of K. pneumoniae isolates was carried out on the basis of morphological, cultural, and biochemical characteristics. Interpretation of antimicrobial resistance was performed according to EUCAST breakpoints. There were four different resistotypes of carbapenemase-producing K. pneumoniae in this study and all were confirmed positive for blaOXA-48 carbapenemase. Rep-PCR fingerprinting of these strains showed the presence of the two different genetic patterns with no similarity between them. The monitoring, surveillance, and molecular typing are essential to control the emergence of multidrug-resistant strains in nosocomial settings, and to reduce the frequency of outbreak occurrence.

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