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Higher Virulence Renders K2 Klebsiella pneumoniae a Stable Share Among Those from Pyogenic Liver Abscess

Min Dong1, Xiumin Ma2, Donglian Wang3

  • 1Department of Pulmonary Diseases (Department of Respiratory and Critical Care Medicine), Gansu Provincial Hospital of Traditional Chinese Medicine, Lanzhou, Gansu, People's Republic of China.

Infection and Drug Resistance
|January 31, 2024
PubMed
Abstract

Insights

Serotype K2 Klebsiella pneumoniae is more virulent than K1, explaining its stable share in pyogenic liver abscess (PLA). This greater virulence, despite similar virulence factors, provides a survival advantage for K2 strains in PLA infections.

Area of Science:

  • Microbiology
  • Infectious Diseases
  • Genetics

Background:

  • Pyogenic liver abscess (PLA) is a severe infection often caused by Klebsiella pneumoniae.
  • Serotype K2 is a significant cause of PLA, maintaining a stable prevalence.

Purpose of the Study:

  • To investigate the reasons behind the consistent prevalence of serotype K2 Klebsiella pneumoniae in PLA cases.
  • To compare the virulence and genetic characteristics of K2 and K1 Klebsiella pneumoniae strains from PLA and non-PLA sources.

Main Methods:

  • Collected Klebsiella pneumoniae strains (K1 and K2) from PLA and non-PLA sources in China.
  • Performed sequence typing, molecular serotyping, PCR for virulence genes, and Galleria mellonella lethality assays.
  • Analyzed differences in virulence gene profiles and sequence types between K1 and K2 strains, and between PLA and non-PLA K2 strains.

Main Results:

  • K2 Klebsiella pneumoniae strains from PLA showed significant differences in the prevalence of virulence genes peg-344 and iucA compared to non-PLA K2 strains.
  • K1 and K2 strains from PLA differed in the rates of virulence genes allS and irp2.
  • Galleria mellonella lethality assays indicated that K2 strains are more virulent than K1 strains, even with similar virulence factor backgrounds.

Conclusions:

  • Serotype K2 Klebsiella pneumoniae exhibits higher intrinsic virulence than serotype K1, contributing to its stable share in PLA.
  • The enhanced virulence of K2 strains provides a survival advantage, enabling their consistent presence in pyogenic liver abscess cases.
Keywords:
Klebsiella pneumoniaegenepyogenic liver abscessserotypevirulence

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