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Related Experiment Videos

Quantitative study of the interaction between two antibiotics by agar diffusion.

J Lauzer1, J Vincelette

  • 1Département de Microbiologie et Immunologie, Université de Montréal, Québec, Canada.

The Journal of Antimicrobial Chemotherapy
|March 1, 1988
PubMed
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A novel agar diffusion method quantifies antibiotic interactions using a fractional critical concentration (FCC) index. This technique shows over 80% agreement with traditional methods, offering a promising alternative for antibiotic synergy testing.

Area of Science:

  • Microbiology
  • Pharmacology
  • Analytical Chemistry

Background:

  • Quantifying antibiotic interactions is crucial for understanding synergistic or antagonistic effects.
  • Traditional methods like the chequerboard microdilution technique can be time-consuming and resource-intensive.
  • Developing rapid and reliable methods for assessing antibiotic synergy is an ongoing challenge in infectious disease research.

Purpose of the Study:

  • To define and validate a novel agar diffusion method for quantifying antibiotic interactions.
  • To introduce the fractional critical concentration (FCC) index as a measure of antibiotic interaction in agar diffusion.
  • To compare the results of the FCC index with the established fractional inhibitory concentration (FIC) index.

Main Methods:

  • A fractional critical concentration (FCC) index was defined, analogous to the fractional inhibitory concentration (FIC) index.

Related Experiment Videos

  • Filter paper strips with varying antibiotic concentrations were placed at right angles on inoculated agar plates.
  • After diffusion and incubation, the FCC index was calculated and compared to FIC indices from chequerboard microdilution.

    • Main Results:

    • Three antibiotic combinations were tested: trimethoprim-sulphamethoxazole, tobramycin-cefazolin, and vancomycin-rifampicin.
    • The FCC index demonstrated over 80% agreement with FIC indices obtained via the chequerboard microdilution technique.
    • The novel agar diffusion method showed promising results in quantifying antibiotic interactions.

    Conclusions:

    • The developed agar diffusion method using the FCC index is a promising technique for assessing antibiotic interactions.
    • This method offers a potentially faster and more accessible alternative to traditional microdilution techniques.
    • Further evaluation of this novel diffusion method is warranted for its broader application in clinical and research settings.