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Bacterial identification relies on a diverse array of techniques to classify and understand microorganisms, each tailored to uncover specific characteristics. Traditional morphological approaches, while still valuable, are limited for closely related or structurally simple organisms. Modern methods integrate biochemical, serological, genetic, and advanced molecular tools to achieve greater accuracy.Morphological and Biochemical TechniquesMorphological characteristics, such as cell shape and...
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Related Experiment Video

Updated: Aug 24, 2025

Isolation and Identification of Waterborne Antibiotic-Resistant Bacteria and Molecular Characterization of their Antibiotic Resistance Genes
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Sequence-Based Identification of Metronidazole-Resistant Clostridioides difficile Isolates.

Wiep Klaas Smits, Céline Harmanus, Ingrid M J G Sanders

    Emerging Infectious Diseases
    |October 26, 2022
    PubMed
    Summary

    The pCD-METRO plasmid causes metronidazole resistance in Clostridioides difficile. This plasmid is widespread in clinical and veterinary settings in the Americas, necessitating detection via PCR or genomic assays.

    Keywords:
    Antimicrobial resistanceBrazilClostridioides difficileSouth AmericaUnited Statesbacteriaenteric infectionsmetronidazolepCD-METROplasmidsequence analysisthe Netherlands

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    Area of Science:

    • Microbiology
    • Genetics
    • Infectious Diseases

    Background:

    • Clostridioides difficile is an opportunistic pathogen causing significant healthcare-associated infections.
    • Metronidazole is a key antibiotic for treating C. difficile infections.
    • Emergence of antibiotic resistance in C. difficile poses a therapeutic challenge.

    Purpose of the Study:

    • To characterize the pCD-METRO plasmid responsible for metronidazole resistance in C. difficile.
    • To investigate the prevalence and distribution of pCD-METRO in clinical and veterinary isolates.
    • To recommend diagnostic strategies for identifying metronidazole-resistant C. difficile.

    Main Methods:

    • Plasmid sequencing and comparative analysis.
    • Isolate screening from clinical and veterinary sources.
    • Development and validation of molecular detection methods (PCR, genomic assays).

    Main Results:

    • High sequence similarity was observed among pCD-METRO plasmids from diverse isolates.
    • The pCD-METRO plasmid and associated resistant C. difficile strains were identified in reservoirs across the Americas.
    • The presence of pCD-METRO correlates with metronidazole resistance.

    Conclusions:

    • The pCD-METRO plasmid is a significant driver of metronidazole resistance in C. difficile.
    • Widespread dissemination of pCD-METRO in both human and animal populations necessitates surveillance.
    • Molecular detection methods like PCR are recommended for timely identification of resistant strains.