Laboratory Medicine ›› 2025, Vol. 40 ›› Issue (9): 885-891.DOI: 10.3969/j.issn.1673-8640.2025.09.010

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Risk factors,drug resistance and virulence analysis of Klebsiella pneumoniae bloodstream infection

LI Li, DU Jinye, WANG Xinyi, DAI Jing()   

  1. Department of Clinical Laboratory,Ruijin Hospital,Shanghai Jiao Tong University School of Medicine,Shanghai 201801,China
  • Received:2024-07-05 Revised:2024-12-26 Online:2025-09-30 Published:2025-09-30

Abstract:

Objective To investigate the risk factors,drug resistance and virulence characteristics of bloodstream infection(BSI)caused by Klebsiella pneumoniae(KPN),in order to provide a reference for clinical intervention and treatment. Methods From April 2018 to September 2023,64 KPN patients with BSI(observation group)and 66 KPN patients without BSI(control group)were enrolled from the North Branch of Ruijin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine. The clinical data and pathogenic differences between the 2 groups were compared. The virulence of KPN in blood was determined by mucin filament test and virulence gene determination. Logistic regression analysis was used to evaluate the influencing factors of KPN BSI occurrence. Results The department distribution of 64 KPN BSI patients was mainly in the intensive care unit(ICU)(40.6%),and 59.4% of the patients had primary infection,mainly with respiratory system infection(73.7%). Deep venous catheterization was an independent risk factor for KPN BSI [odds ratio(OR)=14.708,95% confidence interval(CI)was 4.051-53.401,P<0.001]. The drug resistance rates of BSI KPN to β-lactams,quinolones and compound sulfamethoxazole were 60%-70%,while the drug resistance rate to aminoglycosides was relatively low(<50%). Totally 39 isolates(60.9%)of carbapenem-resistant Klebsiella pneumoniae(CRKP)were determined. The use of intravenous catheters and respiratory system infection were independent risk factors for CRKP infection in KPN BSI patients. Among the 64 KPN isolates,10 isolates(15.6%)showed positive results in the mucin filament test. There were 3 isolates of CRKP,among which 1 isolate was isolated from a patient with BSI and liver abscess. This isolate carried the rmpA2,magA,iucA,iroN and alls genes simultaneously,and it was a carbapenem-resistant hypervirulent Klebsiella pneumoniae(CR-hvKP). Conclusions Patients with CRKP infection in the primary lesion and deep venous catheterization are prone to BSI. Clinically,it is necessary to routinely monitor CR-hvKP to take timely prevention and control measures.

Key words: Klebsiella pneumoniae, Bloodstream infection, Carbapenem-resistant Klebsiella pneumoniae, Virulence

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