Clinical Epidemiology of Klebsiella Pneumoniae Infections

Klebsiella pneumoniae is a Gram-negative bacillus responsible for a spectrum of illnesses ranging from community-acquired pneumonia to life-threatening sepsis and nosocomial outbreaks. Its capacity to acquire virulence factors, such as polysaccharide capsules, alongside mobile genetic elements encoding extended-spectrum β-lactamases and carbapenemases, has driven a global rise in multidrug-resistant strains. Epidemiological surveillance demonstrates variable incidence across regions, with higher burdens in settings lacking robust infection-control measures. Healthcare-associated infections frequently present in patients with comorbidities or indwelling devices, while hypervirulent lineages have re-emerged in the community, particularly in East Asia. Clinical outcomes are determined by host factors, site of infection and promptness of effective therapy. Mortality rates for bacteremia and pneumonia remain high, often exceeding 20–30 %, and climb further when resistance compromises empirical treatment. Emerging molecular tools for rapid pathogen detection, coupled with integrated “omics” analyses, are refining our understanding of host–pathogen interactions and guiding novel therapeutic and preventive strategies. Vaccines targeting key capsular antigens and monoclonal antibodies against surface components are under investigation. Global collaboration in surveillance, antimicrobial stewardship and clinical trials is essential to mitigate the threat posed by K. pneumoniae and to inform context-specific guidelines for diagnosis, treatment and prevention.

Research from Nature Portfolio

Recent studies have applied integrated genomic, transcriptomic, proteomic and metabolomic approaches to clinical isolates of K. pneumoniae, identifying conserved pathways activated during sepsis, including lipid-biosynthesis remodelling and mechanisms of osmotic adaptation in human serum. This multi-omics reference dataset offers a platform for target discovery and translational research. Foundational work has also illuminated how multidrug-resistant K. pneumoniae modulates virulence and resistance gene expression in response to co-pathogens, commensals and host cells. These experiments reveal species-specific interactions that influence antimicrobial susceptibility and suggest that manipulation of the local microbiome could become an adjunctive strategy in treating polymicrobial infections involving resistant K. pneumoniae.

Clinical Epidemiology of Klebsiella Pneumoniae Infections publication trend

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

Technical terms

Sepsis: A dysregulated host response to infection leading to life-threatening organ dysfunction.

Nosocomial infection: An infection acquired in hospital, typically appearing 48 hours or more after admission.

Bacteremia: The presence of bacteria circulating in the bloodstream, often leading to systemic infection.

Extended-spectrum β-lactamase (ESBL): An enzyme conferring resistance to penicillins and cephalosporins by hydrolysing the β-lactam ring.

Carbapenem-resistant Klebsiella pneumoniae (CRKP): Strains producing carbapenemases that render carbapenem antibiotics ineffective.

Multi-omics: The combined use of genomics, transcriptomics, proteomics and metabolomics to study biological responses at multiple molecular levels.

References

1. Integrative omics identifies conserved and pathogen-specific responses of sepsis-causing bacteria. Nature Communications (2023).
2. Child deaths caused by Klebsiella pneumoniae in sub-Saharan Africa and south Asia: a secondary analysis of Child Health and Mortality Prevention Surveillance (CHAMPS) data. The Lancet Microbe (2024).
3. Klebsiella pneumoniae bacteremia mortality: a systematic review and meta-analysis. Frontiers in Cellular and Infection Microbiology (2023).
4. Clinical characteristics, antimicrobial resistance and capsular types of community-acquired, healthcare-associated, and nosocomial Klebsiella pneumoniae bacteremia. Antimicrobial Resistance & Infection Control (2019).
5. Invasive infection caused by Klebsiella pneumoniae is a disease affecting patients with high comorbidity and associated with high long-term mortality. PLOS ONE (2018).
6. Clinical and Microbiological Characteristics of Bacteremic Pneumonia Caused by Klebsiella pneumoniae. Frontiers in Cellular and Infection Microbiology (2022).
7. Multidrug resistant pathogens respond differently to the presence of co-pathogen, commensal, probiotic and host cells. Scientific Reports (2018).