Related Experiment Video
Updated: Feb 10, 2026
13:48
Design and Construction of an Urban Runoff Research Facility
Published on: August 8, 2014
13.6K
Variable chlorhexidine MICs across Klebsiella species from a single facility
David Lehman1, Aubrey E Hetzler1, Tayloe Friedrich1
1Division of Infectious Diseases and International Health, Department of Medicine, University of Virginia School of Medicine, Charlottesville, Virginia, USA.
Antimicrobial Agents and Chemotherapy
|February 9, 2026
Summary
This study found varying chlorhexidine resistance in hospital Klebsiella species. Klebsiella quasipneumoniae showed the highest minimal inhibitory concentrations (MICs), suggesting biocides shape microbial resistance.
Area of Science:
- Microbiology
- Antimicrobial Resistance
- Hospital Epidemiology
Background:
- Chlorhexidine is a widely used hospital antiseptic.
- Increasing biocide use may drive antimicrobial resistance in bacteria.
- Klebsiella species are common hospital-acquired pathogens.
Purpose of the Study:
- To evaluate in vitro chlorhexidine minimal inhibitory concentrations (MICs) across different Klebsiella species.
- To investigate potential genetic factors associated with chlorhexidine resistance in Klebsiella.
- To understand the impact of chlorhexidine use on Klebsiella populations in a hospital setting.
Main Methods:
- Collected Klebsiella isolates from a hospital environment with extensive chlorhexidine usage.
- Performed in vitro minimal inhibitory concentration (MIC) testing for chlorhexidine.
- Conducted whole genome sequencing on the isolates.
Main Results:
- Significant variation in chlorhexidine MICs was observed among Klebsiella species.
- Klebsiella quasipneumoniae exhibited the highest MICs compared to other species.
- No direct correlation found with acquired resistance genes; however, chromosomal efflux pumps varied by species.
Conclusions:
- Species-specific differences in chlorhexidine susceptibility exist within the Klebsiella genus.
- Chromosomal factors, like efflux pumps, may play a role in intrinsic resistance.
- Hospital biocides like chlorhexidine can potentially influence the composition and resistance profiles of microbial communities.
Related Concept Videos
01:17What is a Species?
50.5K
Overview
50.5K
01:39Keystone Species
25.0K
Measures of species biodiversity, such as richness (i.e., the number of species present) and evenness (i.e., their relative abundance), describe an ecological community’s structure. Many factors affect community structure, including abiotic factors (e.g., sunlight and nutrients), disturbances (e.g., fire or flood), species interactions (e.g., predation or competition), and chance events (e.g., foreign species invasion). Certain species—such as keystone species—also play a...
25.0K
01:31Formation of Species
45.3K
Speciation describes the formation of one or more new species from one or sometimes multiple original species. The resulting species are discrete from the parent species, and barriers to reproduction will typically exist. There are two primary mechanisms, speciation with and without geographic isolation—allopatric and sympatric speciation, respectively.
45.3K
01:11Variability: Analysis
524
Measures of variability are statistical metrics that reveal the dispersion pattern within a dataset. They are pivotal in biostatistics, providing insights into the heterogeneity within health and biological data. Variability signifies the degree to which data points diverge from one another, helping researchers understand the potential range of values and associated uncertainty within the data.
The range is a simple measure of variability, indicating the difference between the highest and...
The range is a simple measure of variability, indicating the difference between the highest and...
524
01:09Random Variables
17.9K
A random variable is a single numerical value that indicates the outcome of a procedure. The concept of random variables is fundamental to the probability theory and was introduced by a Russian mathematician, Pafnuty Chebyshev, in the mid-nineteenth century.
Uppercase letters such as X or Y denote a random variable. Lowercase letters like x or y denote the value of a random variable. If X is a random variable, then X is written in words, and x is given as a number.
For example, let X = the...
Uppercase letters such as X or Y denote a random variable. Lowercase letters like x or y denote the value of a random variable. If X is a random variable, then X is written in words, and x is given as a number.
For example, let X = the...
17.9K
01:30Graphs of Equations in Two Variables
261
An equation with two variables, typically written in the form y = f(x) or Ax + By = C, describes a relationship between quantities represented by x and y. Each solution to such an equation is an ordered pair (x, y) that satisfies the equation when substituted. These pairs can be represented graphically to understand the variables' relationship visually.A common technique for constructing the graph of a two-variable equation is to create a value table. Begin by choosing several values for the...
261