Development of New Tools to Detect Colistin-Resistance among Enterobacteriaceae Strains

Area of Science:

• Microbiology
• Clinical Diagnostics
• Antimicrobial Resistance

Background:

• The emergence of plasmid-mediated colistin resistance (mcr-1 gene) poses a significant clinical challenge.
• Current phenotypic methods struggle to reliably detect low-level colistin resistance near clinical breakpoints.
• Evolving susceptibility testing recommendations for polymyxins complicate routine laboratory implementation.

Purpose of the Study:

• To review current clinical microbiology diagnostic techniques for colistin resistance.
• To evaluate the ability of existing methods to detect diverse colistin resistance mechanisms.
• To describe novel tools developed for detecting plasmid-mediated colistin resistance.

Main Methods:

• Review of current literature on colistin resistance detection.
• Analysis of phenotypic, susceptibility testing, and genotyping methods.
• Inclusion of recent studies on specific colistin resistance detection techniques.

Main Results:

• Phenotypic methods often lack sensitivity for low-level resistance conferred by mcr genes.
• The diversity of resistance mechanisms complicates rapid molecular detection.
• Specific tools are being developed to address the challenge of detecting plasmid-mediated colistin resistance.

Conclusions:

• Accurate and comprehensive detection of colistin resistance is crucial for patient care.
• Well-defined protocols and specific tools are needed to identify all colistin-resistant bacteria.
• Ongoing research focuses on developing sensitive and specific diagnostic approaches for emerging resistance mechanisms.