Abstract
Objective
Biofilm formation has made the therapy of bacterial infections more difficult. The objective our study was assessment of pan-drug-resistant (PDR) Klebsiella oxytoca pathogenicity and virulence factors causing AAHC in patients with colorectal cancer (CRC).
Materials and Methods
Among a total of 300 healthy and 300 patients with antibiotic-associated hemorrhagic colitis (AAHC) and CRC, 200 K. oxytoca were identified during May 2015–January 2019. The virulence properties and biofilm formation among the isolates were investigated by phenotypic, PCR, and real-time PCR (RT-qPCR) techniques.
Results
The blaCTX-M1 (20%), blaSHV (11%), blaTEM1 (33%), and AmpC encoding CIT (2%) ESBL genes, carbapenemase-encoding genes blaIM (4%) and blaOXA-48 (2%), and colistin-resistant mcr-1 gene (2.5%) were detected. The virulence-encoding genes including fimA (80%), pilQ (100%), matB (100%), mrkA (80%), and npsB (100%) were amplified. Therefore, PDR K. oxytoca containing adhesins and toxin-encoding genes with ability of biofilm formation causing AAHC and CRC were isolated. There was a significant difference between healthy and patients with CRC regarding the presence of K. oxytoca (p = 00.221).
Conclusion
Bacterial enteric pathogens possibly play a role in CRC. Biofilm formation by K. oxytoca strains prevents the efficient infection elimination; therefore, rapid identification and control measure are chief requirements. Additionally, more investigations are necessary with this regard.
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Acknowledgments
This study was supported by Kufa University.
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This study was funded by the University of Al-Qadisiyah, College of Science.
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This study was ethically approved by University of Al-Qadisiyah, College of Science.
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The authors received research grants from the University of Al-Qadisiyah, College of Science, Iraq.
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Abbas, A.F., Al-Saadi, A.G.M. & Alkhudhairy, M.K. Biofilm Formation and Virulence Determinants of Klebsiella oxytoca Clinical Isolates from Patients with Colorectal Cancer. J Gastrointest Canc 51, 855–860 (2020). https://doi.org/10.1007/s12029-019-00317-7
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DOI: https://doi.org/10.1007/s12029-019-00317-7