Klebsiella pneumoniae producing extended-spectrum β-lactamase (ESBL) cause severe life threatening infections resulting in considerable morbidity and mortality especially in neonatology ward. The aim of this study was to evaluate the epidemiology and resistance of 131 strains collected between 2007 and 2008 in neonatology and pediatric wards and to determine the mode of their epidemic spread. The isolates were identified, tested for antimicrobial susceptibility with the disk-diffusion on Mueller-Hinton agar. The type of ESBL was determined by polymerase chain reaction (PCR) followed by sequencing for CTX-M enzymes. The epidemiological relationships between epidemic strains were analysed by pulsedfield gel electrophoresis. In this study, antibiotic susceptibility testing showed resistance to all β-lactams except imipenem with a concomitant resistance to aminoglycosides, tetracycline and cotrimoxazole. Fluoroquinolones still have activity against strains. Characterization of β-lactamases encoding genes revealed that all strains have SHV β-lactamases. TEM-type and CTX-M-1 group were encoded, respectively, in 21 and 57% of ESBLs isolates. Among 84 strains tested by PFGE, 14 pulsotypes were identified. DNA sequencing of amplified CTX-M β-lactamase genes justified diffusion of CTX-M-15 between epidemic strains. In conclusion, this study revealed a high degree of clonal diversity of isolates and complexity of outbreaks that involve more than two epidemic pulsotypes and indicated that both clonal spread of epidemic strains and transfer of β-lactamases might contribute to epidemic dissemination of ESBL in neonatology ward.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.