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Combining diagnostic methods for antimicrobial susceptibility testing - A comparative approach.

Sylvia Natalie Kłodzińska1, Petra Alexandra Priemel1, Thomas Rades1

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Combining minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) testing offers a more comprehensive understanding of antibiotic effectiveness. Standardizing MIC readings at 20 hours ensures reliable antimicrobial susceptibility testing (AST) data.

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Area of Science:

  • Microbiology
  • Pharmacology
  • Clinical Diagnostics

Background:

  • Minimum Inhibitory Concentration (MIC) is standard for antimicrobial susceptibility testing (AST).
  • MIC is insufficient when bacterial killing is critical, such as in immunocompromised patients.
  • Minimum Bactericidal Concentration (MBC) provides a more reliable measure of antibiotic activity in such cases.

Purpose of the Study:

  • To demonstrate and recommend combined methods for MIC and MBC measurements.
  • To emphasize the importance of uniform protocols for MIC and MBC procedures.
  • To highlight the optimal time point for reading MIC results (20 hours).

Main Methods:

  • Evaluated broth microdilution, calorimetric, and microscopy-based screening systems (MBSS) for MIC.
  • Compared fluorophore staining (SYTO9/propidium iodide) with broth regrowth for MBC determination.
  • Assessed kinetic and end-point effects of antibiotics.

Main Results:

  • Presented three scenarios for combining MIC and MBC methods based on time, cost, or sensitivity.
  • MBSS and isothermal calorimetry detected delayed bacterial growth up to 18 hours.
  • A one-fold change in MIC values was observed between 16h and 20h incubation.

Conclusions:

  • Combining MIC and MBC determinations yields more clinically relevant data for optimized therapies.
  • Establishing a 20-hour reading time point for MIC provides more uniform AST data across laboratories.
  • Enhanced understanding of bacteria susceptibility to antibiotics is achieved through combined testing.