Hypervirulent Klebsiella pneumoniae and Liver Abscess Pathogenesis

Hypervirulent Klebsiella pneumoniae (hvKp) has emerged as a distinct pathotype capable of causing severe community-acquired infections, notably pyogenic liver abscess. Unlike classical strains, hvKp often affects healthy individuals, rapidly breaching mucosal surfaces and disseminating via the bloodstream to the liver and other organs. Central to its pathogenesis is a hypermucoviscous capsule that confers resistance to phagocytosis, combined with potent iron-scavenging systems (siderophores) and accessory toxins encoded on mobile genomic islands. Initial colonisation of the gut sets the stage for translocation across the intestinal barrier, followed by survival in the bloodstream and hepatic invasion, where abscess formation leads to high morbidity. Host factors such as diabetes, alcoholism and immunosenescence modulate susceptibility and disease severity. Advances in genomics and molecular microbiology are illuminating the interplay between hvKp virulence determinants and host responses, guiding the development of diagnostics, therapeutics and prevention strategies with global relevance.

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Hypervirulent Klebsiella pneumoniae and Liver Abscess Pathogenesis publication trend

The graph below shows the total number of articles in hypervirulent klebsiella pneumoniae and liver abscess pathogenesis across all publications each year (not limited to Nature Index journals).

Technical terms

Hypervirulent Klebsiella pneumoniae (hvKp): A pathotype distinguished by enhanced invasiveness and the ability to cause community-acquired infections in healthy hosts.

Hypermucoviscosity: A phenotype characterised by a hyperthick capsule that impedes phagocytosis and complement resistance.

Genomic island: A discrete DNA segment acquired through horizontal transfer that often carries virulence or antibiotic resistance genes.

Microcin E492: A bacteriocin toxin produced by hvKp that can kill or inhibit competing bacteria in the gut.

Colibactin: A genotoxin that promotes colonisation by damaging host cells and modulating microbiota composition.

Gas6: A host lectin-like protein supporting intestinal barrier function by strengthening tight junctions and limiting bacterial translocation.

Siderophore: A high-affinity iron-chelating molecule secreted by bacteria to acquire iron from the host environment.

References

1. Hypervirulent Klebsiella pneumoniae employs genomic island encoded toxins against bacterial competitors in the gut. The ISME Journal: Multidisciplinary Journal of Microbial Ecology (2024).
2. Gas6 ameliorates intestinal mucosal immunosenescence to prevent the translocation of a gut pathobiont, Klebsiella pneumoniae, to the liver. PLOS Pathogens (2023).
3. Virulence Factors in Hypervirulent Klebsiella pneumoniae. Frontiers in Microbiology (2021).