Related Experiment Video
Updated: Jul 6, 2025
Isolation and Identification of Waterborne Antibiotic-Resistant Bacteria and Molecular Characterization of their Antibiotic Resistance Genes
Published on: March 3, 2023
Need for standardization in sub-lethal antibiotics research
Fabian Thurner1, Fatima AlZahra'a Alatraktchi1
1Department of Science and Environment, Roskilde University, Roskilde, Denmark.
Abstract:
While monitoring and managing resistant and persistent microbes is of utmost importance and should not be glossed over, one must also focus on mitigating the microbe's ability to cause harm. Exploring the concept of lowering or even suppressing the microbe's virulence with sub-Minimum Inhibitory Concentration (MIC) antibiotics holds promise and warrants further investigation. At present, such antibiotic concentrations have mostly been studied to cover the side-effects of gradient exposure, overlooking the possibility of utilizing them to influence not only bacterial virulence, but also colonization, fitness and collateral sensitivities. This review focuses on conflicting findings of studies demonstrating both increased and decreased virulence in microbes under sub-MIC antibiotic exposure. It identifies lack of standardization in this field of research as one of the main culprits for discordant results across numerous studies on virulence. It critically discusses important terminology related to bacterial traits and existing methods to determine MIC and sub-MIC ranges. Lastly, possible directions toward standardized sub-MIC profiling and thereby tailored treatment options in the future are explored.
Insights
Sub-Minimum Inhibitory Concentration (MIC) antibiotics may reduce microbial harm by lowering virulence. Standardizing research methods is crucial for developing tailored treatments that target bacterial virulence and fitness.
Area of Science:
- Microbiology
- Pharmacology
- Infectious Diseases
Background:
- Managing microbial resistance and persistence is critical.
- Reducing microbial harm by suppressing virulence is a promising strategy.
- Sub-Minimum Inhibitory Concentration (MIC) antibiotics are underexplored for virulence modulation.
Purpose of the Study:
- To review conflicting findings on sub-MIC antibiotic effects on microbial virulence.
- To identify reasons for discordant results in sub-MIC virulence studies.
- To explore directions for standardized sub-MIC profiling and tailored treatments.
Main Methods:
- Literature review of studies investigating sub-MIC antibiotic effects on microbial virulence.
- Critical discussion of terminology, MIC, and sub-MIC determination methods.
- Analysis of conflicting data regarding increased and decreased virulence.
Main Results:
- Sub-MIC antibiotic exposure can paradoxically increase or decrease microbial virulence.
- Lack of standardization in research methodology is a primary cause of conflicting results.
- Existing studies often overlook the impact of sub-MIC antibiotics on colonization, fitness, and collateral sensitivities.
Conclusions:
- Further research is needed to understand and harness the effects of sub-MIC antibiotics on virulence.
- Standardized methods for sub-MIC profiling are essential for reliable results.
- Tailored treatment strategies utilizing sub-MIC antibiotics may offer new therapeutic avenues.
