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Related Experiment Videos

Broth microdilution susceptibility testing for Leptospira spp.

Clinton K Murray1, Duane R Hospenthal

  • 1Infectious Disease Service, Department of Medicine, Brooke Army Medical Center, Fort Sam Houston, Texas 78234, USA.

Antimicrobial Agents and Chemotherapy
|April 24, 2004
PubMed
Summary

A new broth microdilution method using alamarBlue offers a faster, streamlined approach to determine antimicrobial activity against Leptospira serovars, aiding empirical treatment decisions for leptospirosis.

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Area of Science:

  • Microbiology
  • Infectious Diseases
  • Antimicrobial Resistance

Background:

  • Leptospirosis treatment relies on empirical antimicrobial choices due to diagnostic delays.
  • Current in vitro susceptibility testing methods for Leptospira are time-consuming.
  • Expanding antimicrobial options requires efficient susceptibility testing.

Purpose of the Study:

  • To develop and validate a rapid broth microdilution method for Leptospira antimicrobial susceptibility testing.
  • To compare the results of the novel microdilution method with traditional broth macrodilution.
  • To assess the utility of the microdilution method for a broad range of Leptospira serovars and antimicrobials.

Main Methods:

  • A broth microdilution technique was developed using the alamarBlue growth indicator.

Related Experiment Videos

  • Minimum Inhibitory Concentrations (MICs) were determined for six antimicrobials against 12 Leptospira serovars.
  • Results were compared to those obtained using standard broth macrodilution techniques.

    • Main Results:

    • The microdilution method demonstrated high internal validity and reproducibility, comparable to macrodilution.
    • Reproducibility for MIC microdilution was 99% within two dilutions, versus 89% for macrodilution.
    • Both methods yielded comparable MIC90 values for all tested antimicrobials.

    Conclusions:

    • The alamarBlue broth microdilution technique is a reliable and faster alternative for Leptospira antimicrobial susceptibility testing.
    • This method can broaden empirical therapeutic options for leptospirosis.
    • The streamlined approach facilitates broader screening of antimicrobials against diverse Leptospira strains.