Type VI secretion system (T6SS) in Klebsiella pneumoniae , relation to antibiotic resistance and biofilm formation.

Autor: Mohamed NA; Department of Medical Microbiology and Immunology, Faculty of Medicine, Sohag University, Sohag, Egypt., Alrawy MH; Department of Clinical and Chemical Pathology, Faculty of Medicine, Sohag University, Sohag, Egypt., Makbol RM; Department of Tropical Medicine & Gastroenterology, Faculty of Medicine, Sohag University, Sohag, Egypt., Mohamed AM; Department of Otorhinolaryngology, Sohag University, Sohag, Egypt., Hemdan SB; Department of Medical Biochemistry, Sohag University, Sohag, Egypt., Shafik NS; Department of Medical Microbiology and Immunology, Faculty of Medicine, Sohag University, Sohag, Egypt.
Jazyk: angličtina
Zdroj: Iranian journal of microbiology [Iran J Microbiol] 2023 Oct; Vol. 15 (5), pp. 601-608.
DOI: 10.18502/ijm.v15i5.13865
Abstrakt: Background and Objectives: The type VI secretion system (T6SS) was identified as a novel virulence factor in many Gram-negative bacteria. This study aimed to investigate the frequency of the T6SS genes in Klebsiella pneumoniae -causing different nosocomial infections, and to study the association between T6SS, antibiotic resistance, and biofilm formation in the isolated bacteria.
Materials and Methods: A total of fifty-six non-repetitive K. pneumoniae isolates were collected from different inpatients admitted at Sohag University Hospital from September 2022 to March 2023. Samples were cultured, colonies were identified, and antimicrobial sensitivity was done by VITEK® 2 Compact. Biofilm formation was checked using Congo red agar method. T6SS genes, and capsular serotypes were detected by PCR.
Results: Fifty-six K. pneumoniae isolates were obtained in culture. 38 isolates (67.86%) produced biofilm and 44 (78.57%) were positive for T6SS in PCR. There was a significant association between the presence of T6SS and resistance to the following antibiotics: meropenem, ciprofloxacin, and levofloxacin. All biofilm-forming bacteria had T6SS, with significant differences towards T6SS -positive bacteria. There was no significant association between T6SS, and the presence of certain capsular types.
Conclusion: The T6SS-positive K. pneumoniae has greater antibiotic resistance, and biofilm-forming ability which is considered a potential pathogenicity of this emerging gene cluster.
(Copyright © 2023 The Authors. Published by Tehran University of Medical Sciences.)
Databáze: MEDLINE
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