Recently, emergence of carbapenem-resistance, in particular due to Klebsiella pneumoniae carbapenemase (KPC), was observed among K. pneumoniae causing urinary tract infections in Croatia. The aim of the study was to characterize, antimicrobial susceptibility, carbapenem resistance, virulence traits and plasmid types of the urinary KPC positive isolates of K. pneumoniae. The antimicrobial susceptibility to a wide range of antibiotics was determined by broth microdilution method. The transferability of meropenem resistance was determined by conjugation (broth mating method) employing Escherichia coli J63 strain resistant to sodium azide. Genes encoding broad and extended-spectrum β-lactamases, plasmid-mediated AmpC β-lactamases, group A and B carbapenemases, and carbapenem hydrolyzing oxacillinases (blaOXA-48like), respectively, were determined by Polymerase chain reaction (PCR). In total 30 KPC-positive K. pneumoniae urinary isolates collected from different regions of Croatia were analysed. The isolates were uniformly resistant to all tested antibiotics except for variable susceptibility to gentamicin, sulphamethoxazole/trimethoprim, and colistin, respectively. Four isolates were resistant to colistin with MICs values ranging from 4 to 16 mg/L. All tested isolates were susceptible to ceftazidime/avibactam. Sixteen isolates transferred meropenem resistance to E. coli recipient strain by conjugation. Other resistance markers were not co-transferred. PCR was positive for blaKPC and blaSHV genes in all isolates whereas 13 isolates tested positive also for blaTEM genes. PCR based replicon typing (PBRT) revealed the presence of FIIs in 13 and FIA plasmid in two strains. The study showed dissemination of KPC-producing K. pneumoniae in urinary isolates, posing a new epidemiological and treatment challenge. Sulphamethoxazole/trimethoprim, colistin, and ceftazidime/avibactam remain so far, as the therapeutic options.
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Conflict of interest
The authors do not declare any conflict of interest.
The Ethical permission was not necessary. The study did not involve human or animal subjects. It is in vitro study. Urine samples were collected for purpose of routine diagnostic and informed consent was not necessary.
The part of the results is in shown in European Congress for Clinical Microbiology and Infectious Diseases (ECCMID) 2020 online library (the congress was cancelled).
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Communicated by Erko Stackebrandt.
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Bedenić, B., Sardelić, S., Bogdanić, M. et al. Klebsiella pneumoniae carbapenemase (KPC) in urinary infection isolates. Arch Microbiol (2021). https://doi.org/10.1007/s00203-020-02161-x
- Klebsiella pneumoniae
- Urinary tract infections