期刊
MICROBIAL PATHOGENESIS
卷 162, 期 -, 页码 -出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.micpath.2021.105085
关键词
Type VI secretion System (T6SS); Klebsiella pneumoniae; Hcp; Virulence; Drug resistance
资金
- National Natural Science Foundation of China [81860368]
- National Mega-project for Inno-vative Drugs [2019ZX09721001, 2019BJZDS003]
- Jiangxi Science and Technology Department in China [20181BAB215032, 20181BAB205065]
This study characterized the type VI secretion system (T6SS) in 248 Klebsiella pneumoniae isolates from a Chinese hospital and found a high prevalence of T6SS genes. T6SS-positive isolates showed higher drug resistance and biofilm formation ability, as well as a higher frequency of virulence genes.
Objectives: The type VI secretion system (T6SS) in Klebsiella pneumoniae strains isolated from the bloodstream, intestinal, the pyogenic liver abscess has been reported. Here we aimed to characterize T6SS in 248 Klebsiella pneumoniae isolates with all kinds of specimens from a Chinese hospital and to investigate the potential association of T6SS with virulence and drug resistance. Methods: T6SS genes, capsular serotyping genes, drug resistance genes, and virulence genes were identified by polymerase chain reaction (PCR). Antibiotic susceptibilities were examined by the disk diffusion method. To assess biofilm formation of these clinical Klebsiella pneumoniae isolates, 96-well microtiter plate assays were performed. MLST was used to analyze the genotypes of these Klebsiella pneumoniae isolates. Results: The frequency of T6SS genes among the clinical Klebsiella pneumoniae isolates was 72.2%. The T6SSpositive isolates displayed higher resistance to piperacillin-tazobactam, ciprofloxacin, levofloxacin, meropenem than the T6SS-negative isolates (P < 0.05). The T6SS-positive isolates formed significantly more biofilm mass than the T6SS-negative isolates (mean +/- standard deviation [SD], 0.3 +/- 0.09 vs.0.16 +/- 0.06; P < 0.01). Compared to the T6SS-negative isolates, the T6SS-positive isolates had a higher frequency of virulence genes (rmpA, fimH, entB, kfu, ybtS) and the pLVPK-like plasmid (P < 0.05). Conclusion: In conclusion, the prevalence of the type VI secretion system is high in clinical Klebsiella pneumoniae isolates in a Chinese teaching hospital. T6SS-positive strains show higher biofilm-forming activity with high drug resistance and exhibit higher virulence potential.
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