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Variable Chlorhexidine Tolerance Across Klebsiella Species from a Single Facility
Biorxiv : the Preprint Server for Biology
|October 3, 2025
Summary
Klebsiella bacteria show varied chlorhexidine tolerance in hospitals. While no acquired resistance was found, differences in tolerance may be influenced by biocide use, impacting microbial populations.
Area of Science:
- Microbiology
- Hospital Infection Control
- Antimicrobial Resistance
Background:
- Chlorhexidine is a widely used antiseptic in healthcare settings.
- Understanding bacterial tolerance to biocides is crucial for infection control.
- Klebsiella species are significant hospital-acquired pathogens.
Purpose of the Study:
- To evaluate in vitro chlorhexidine tolerance among various Klebsiella species.
- To investigate potential links between chlorhexidine tolerance and genetic factors.
- To explore the impact of biocide use on hospital microbial populations.
Main Methods:
- Minimum Inhibitory Concentration (MIC) testing was performed on Klebsiella isolates.
- Whole genome sequencing (WGS) was utilized to analyze genetic profiles.
- Isolates were sourced from a hospital with extensive chlorhexidine usage.
Main Results:
- Significant variation in chlorhexidine tolerance was observed across Klebsiella species.
- Klebsiella quasipneumoniae exhibited the highest MIC values.
- No direct correlation with acquired resistance genes was identified; however, chromosomal efflux pumps were noted in some species.
Conclusions:
- Species-specific differences in chlorhexidine tolerance exist within Klebsiella.
- Biocide selection pressure may influence the composition of hospital microbial communities.
- Further research is needed to understand the mechanisms driving chlorhexidine tolerance.
