Molecular Epidemiology and Virulence Analysis of Klebsiella pneumoniae

Klebsiella pneumoniae represents a major opportunistic pathogen in both healthcare and community settings, characterised by its rapid acquisition of antimicrobial resistance and diverse virulence repertoire. Molecular epidemiology relies on high‐resolution typing methods, including multilocus sequence typing, whole‐genome sequencing and core‐genome phylogenetics, to track clonal lineages across clinical and environmental reservoirs. These approaches have revealed the global dissemination of high‐risk clones, such as ST11, ST37 and ST258, often associated with capsular serotypes K1 and K2 and with extended‐spectrum β‐lactamase or carbapenemase production. Virulence analysis focuses on determinants that contribute to host colonisation and damage, notably siderophore systems (enterobactin, yersiniabactin, salmochelin), fimbrial adhesins (type 1 and type 3), hypermucoviscosity factors (rmpA, magA) and biofilm formation. Integration of resistance and virulence profiling has highlighted convergence between multidrug resistance and hypervirulence in emerging strains. This dual threat underscores the need for robust surveillance networks, tailored infection‐control measures and the development of new diagnostics, vaccines and host‐directed therapies to curtail transmission and mitigate clinical impact worldwide.

Research from Nature Portfolio

Recent studies have characterised hospital‐associated isolates from Europe, revealing a high prevalence of multidrug resistance and virulence gene carriage. One investigation of inpatient strains demonstrated that over two‐thirds produced extended‐spectrum β‐lactamases and harboured adhesin genes (fimH, mrkD) alongside siderophore loci (entB, irp1). Hypervirulent biomarkers, such as rmpA and iroN, were detected in approximately one in six isolates, with many of these also carrying carbapenemase genes, underscoring the convergence of resistance and hypervirulence. An earlier foundational analysis applied ERIC‐PCR and RAPD genotyping to multidrug‐resistant clinical isolates, establishing correlations between specific sequence types, efflux pump genes and virulence determinants. These findings have refined our understanding of the molecular basis for epidemic spread and informed targeted control strategies.

Molecular Epidemiology and Virulence Analysis of Klebsiella pneumoniae publication trend

The graph below shows the total number of articles in molecular epidemiology and virulence analysis of klebsiella pneumoniae across all publications each year (not limited to Nature Index journals).

Technical terms

Whole‐genome sequencing (WGS): High‐throughput determination of an organism’s complete DNA sequence, enabling detailed phylogenetic and resistance gene analyses.

Sequence type (ST): A numerical designation assigned by multilocus sequence typing to distinguish bacterial strains based on allelic profiles.

Extended‐spectrum β‐lactamases (ESBLs): Enzymes that hydrolyse penicillins and cephalosporins, conferring resistance to broad‐spectrum β‐lactam antibiotics.

Siderophores: Iron‐chelating molecules secreted by bacteria to acquire iron from the host environment, critical for pathogenicity.

Hypermucoviscosity: A mucoid phenotype associated with overproduction of capsular polysaccharide, linked to hypervirulent strains.

Biofilm formation: The communal growth of bacteria within an extracellular matrix, promoting persistence and antibiotic tolerance.

References

1. Virulence analysis and antibiotic resistance of Klebsiella pneumoniae isolates from hospitalised patients in Poland. Scientific Reports (2023).
2. Molecular typing and virulence analysis of multidrug resistant Klebsiella pneumoniae clinical isolates recovered from Egyptian hospitals. Scientific Reports (2016).
3. Development and application of an indirect ELISA and nested PCR for the epidemiological analysis of Klebsiella pneumoniae among pigs in China. Frontiers in Microbiology (2024).
4. Crippling of Klebsiella pneumoniae virulence by metformin, N-acetylcysteine and secnidazole. BMC Microbiology (2023).