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Related Experiment Video

Updated: Jun 12, 2026

System for Efficacy and Cytotoxicity Screening of Inhibitors Targeting Intracellular Mycobacterium tuberculosis
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Published on: April 5, 2017

Measuring minimum inhibitory concentrations in mycobacteria.

Frederick A Sirgel1, Ian J F Wiid, Paul D van Helden

  • 1Division of Molecular Biology and Human Genetics, MRC Centre for Molecular and Cellular Biology, Stellenbosch University, Tygerberg, South Africa.

Methods in Molecular Biology (Clifton, N.J.)
|June 19, 2010
PubMed
Summary

This study details an agar dilution method for determining minimum inhibitory concentrations (MICs) of Mycobacterium tuberculosis. This method quantizes drug resistance in M. tuberculosis strains using colony-forming units (CFUs).

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Area of Science:

  • Microbiology
  • Infectious Diseases
  • Pharmacology

Background:

  • Accurate drug-susceptibility testing (DST) is crucial for managing Mycobacterium tuberculosis infections.
  • Traditional methods like proportion, absolute concentration, and resistant ratio methods are established for antimycobacterial DST.
  • Standardized methods are needed to reliably measure drug resistance in M. tuberculosis.

Purpose of the Study:

  • To describe a novel agar dilution method for measuring minimum inhibitory concentrations (MICs) of Mycobacterium tuberculosis.
  • To establish a reproducible protocol for quantifying drug resistance in M. tuberculosis.
  • To provide a foundation for further research into antimycobacterial drug efficacy.

Main Methods:

  • Utilized Middlebrook 7H10 or 7H11 agar medium for culturing Mycobacterium strains.
  • Employed twofold serial dilutions of drug concentrations to determine inhibitory values.
  • Calculated the proportion of resistant bacilli by comparing colony-forming units (CFUs) on drug-free versus drug-containing media.

Main Results:

  • Defined the MIC as the lowest drug concentration inhibiting over 99% of M. tuberculosis growth within 21 days at 37°C.
  • Demonstrated the agar dilution method's capacity to quantify drug resistance based on CFU counts.
  • Established a clear protocol for MIC determination using the proportion method on solid media.

Conclusions:

  • The described agar dilution method provides a reliable approach for determining MICs of Mycobacterium tuberculosis.
  • This method offers a quantitative measure of drug resistance, complementing traditional DST procedures.
  • The findings support the continued use and potential refinement of proportion-based methods in antimycobacterial susceptibility testing.