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Related Experiment Videos

Fusidic acid disk diffusion testing of clostridium difficile can be calibrated using single-strain regression

M Oppenheimer1, G Kronvall, I Karlsson

  • 1Department of Laboratory Medicine, Karolinska Institute, Stockholm, Sweden.

Scandinavian Journal of Infectious Diseases
|February 24, 2001
PubMed
Summary

Single-strain regression analysis (SRA) calibrated the disk diffusion test for fusidic acid susceptibility in Clostridium difficile. This method allows for species-specific interpretations, improving antibiotic susceptibility testing accuracy.

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Area of Science:

  • Microbiology
  • Clinical Diagnostics
  • Pharmacology

Background:

  • Antibiotic susceptibility testing (AST) is crucial for guiding treatment decisions.
  • Clostridium difficile infections require accurate susceptibility data for effective therapy.
  • Standardizing disk diffusion methods ensures reliable results.

Purpose of the Study:

  • To calibrate the disk diffusion antibiotic susceptibility test for fusidic acid against Clostridium difficile using single-strain regression analysis (SRA).
  • To establish species-related and laboratory-specific zone breakpoints for fusidic acid susceptibility testing of C. difficile.

Main Methods:

  • MIC determinations for 40 clinical C. difficile isolates using E-test.
  • Standardization of disk diffusion tests according to the Swedish Reference Group for Antibiotics (SRGA).

Related Experiment Videos

  • Calculation of SRA constants (A and B) using various fusidic acid disk concentrations (1.5-150 µg) and a control strain (ATCC 9689).

    • Main Results:

    • SRA enabled the determination of zone breakpoints for C. difficile.
    • Applying SRGA MIC limits to E-test results identified one resistant strain.
    • Calculated zone breakpoints using SRA constants resulted in all strains being interpreted as susceptible.

    Conclusions:

    • Single-strain regression analysis (SRA) provides a method for calibrating disk diffusion tests.
    • SRA facilitates the development of species-specific and laboratory-specific interpretations for antibiotic susceptibility testing.
    • Calibrated disk tests improve the accuracy and reliability of fusidic acid susceptibility testing for Clostridium difficile.