Molecular typing of clinical and environmental isolates of Klebsiella pneumoniae producing ESBLs by PFGE

Document Type : Original Article

Authors

1 Department of Microbiology and Immunology, Faculty of Medicine, Kashan University of Medical Science, Kashan, Iran

2 Infectious Diseases Research Center, Kashan University of Medical Science, Kashan, Iran

3 Department of Vital Statistics and Epidemiology, School of Health, Kashan University of Medical Sciences, Kashan, Iran

4 Department of Biostatistics, Health Faculty, Kashan University of Medical Sciences, Kashan, Iran

5 Department of Applied Cell Sciences, Faculty of Medicine, Kashan University of Medical Sciences, Kashan, Iran

Abstract

Objective(s): Klebsiella pneumoniae is the common cause of pneumonia in hospitalized patients, particularly in intensive care units (ICU). The infection can transfer by medical equipment such as mechanical ventilators. This study aimed to investigate the molecular typing of the extended-spectrum beta-lactamase-producing K. pneumoniae isolates recovered from Beheshti Hospital, Kashan, Iran. 
Materials and Methods: K. pneumoniae isolates producing ESBLs have been collected from the samples obtained from Shahid Beheshti hospital, Kashan, Iran. Antimicrobial susceptibility was determined using the Kirby Bauer disk diffusion method. The presence of ESBLs was evaluated using CLSI for ESBL screening by the double-disk diffusion method. Molecular typing was conducted by pulsed-field gel electrophoresis (PFGE).  In total, 89 K. pneumoniae isolates were recovered, of which 47.1% were ESBL producers.
Results: Results showed that all of the clinical and environmental isolates were resistant to ceftriaxone, meropenem, cefazolin, cefotaxime, cephalothin, and piperacillin-tazobactam. All isolates were grouped under four clusters (A-D). The major cluster was related to the C cluster with 22 isolates (19 clinical and 3 environmental). Seventy-two percent of isolates were from the ICU ward. There was no correlation between antibiotic resistance patterns and PFGE clusters (P=0.2).
Conclusion: We observed a common molecular signature among both clinical and environmental K. pneumoniae isolates, indicating a similar genotype and likely a common origin for ESBL producer isolates found in different hospital wards. Therefore, hospitals need to implement an effective infection control system to decrease the spreading of ESBL strains within the hospitals and subsequently the transmission of the infection to patients.

Keywords

References

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Iranian Journal of Basic Medical Sciences
Volume 25, Issue 2
February 2022
Pages 208-213

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