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Antimicrobial Susceptibility Testing Methods for Acinetobacter spp.

Balaji Veeraraghavan1, Saranya Vijayakumar2, Agila K Pragasam2

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Summary

Serial twofold dilution methods are standard for determining antibiotic antimicrobial activity. This validated protocol for Acinetobacter species, including A. baumannii, ensures accurate minimum inhibitory concentration determination with proper controls.

Keywords:
Acinetobacter spp.AntimicrobialsDisk diffusionMICSusceptibility

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Area of Science:

  • Microbiology
  • Pharmacology

Background:

  • Serial twofold dilution is a common method for assessing antimicrobial activity.
  • Methods like broth dilution and agar dilution are susceptible to experimental variations, leading to discrepancies.

Purpose of the Study:

  • To present a validated protocol for determining antimicrobial activity in Acinetobacter species.
  • To emphasize the importance of control strains for accurate minimum inhibitory concentration (MIC) determination.

Main Methods:

  • The study validated a serial twofold dilution protocol.
  • The protocol is applicable to Acinetobacter species, specifically A. baumannii.
  • Inclusion of appropriate control strains is crucial.

Main Results:

  • The validated protocol provides reliable antimicrobial activity data.
  • Accurate MIC values depend on the use of control strains.
  • The method is suitable for Acinetobacter species.

Conclusions:

  • A validated serial twofold dilution protocol enhances the accuracy of antimicrobial activity testing.
  • Proper use of control strains is essential for reproducible MIC determination in Acinetobacter species.