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Antimicrobial Effectiveness01:28

Antimicrobial Effectiveness

The effectiveness of antimicrobial agents depends on various factors influencing their ability to eliminate microbial populations. Larger microbial populations require more time for complete eradication, emphasizing the importance of population size analysis when evaluating antimicrobial efficacy.Microbial resistance to antimicrobial agents varies significantly. Highly resilient microorganisms include endospores, gram-negative bacteria, and non-enveloped viruses, while prions are exceptionally...

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Drug susceptibility testing of Nocardia spp. using the disk diffusion method.

Clémence Prudhomme1, Brune Joannard1, Gérard Lina1

  • 1Laboratoire de Biologie médicale de Référence des Nocardioses, Groupement Hospitalier Nord, Institut des Agents Infectieux, Hospices civils de Lyon, Lyon, France.

Annals of Clinical Microbiology and Antimicrobials
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Summary

Disk diffusion drug susceptibility testing (DST) accurately categorizes Nocardia isolates for aminoglycosides and imipenem. This method is a viable alternative to microdilution for specific Nocardia infections, improving treatment strategies.

Keywords:
Nocardia spp.Critical inhibition diametersDisk diffusionDrug susceptibility testingMicrodilution

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Area of Science:

  • Clinical microbiology
  • Antimicrobial resistance
  • Infectious diseases

Background:

  • Drug susceptibility testing (DST) is crucial for effective Nocardia treatment.
  • Current standard, minimum inhibitory concentrations (MICs) by microdilution, is time-consuming.
  • Need for faster, reliable DST methods for Nocardia spp.

Purpose of the Study:

  • Determine critical inhibition diameters for Nocardia spp. using disk diffusion.
  • Evaluate disk diffusion as an alternative DST method to microdilution.
  • Assess performance against U.S. Food and Drug Administration (FDA) criteria.

Main Methods:

  • Microdilution determined MICs for 134 Nocardia isolates.
  • Disk diffusion DST performed in parallel.
  • Receiver-operating-characteristic (ROC) curves used to define critical diameters.
  • Category agreement (CA) and discrepancy rates (major/very major) calculated.

Main Results:

  • Tobramycin: 19 mm critical diameter yielded 98.5% CA, 0% very major discrepancies.
  • Amikacin: 25 mm critical diameter yielded 98.5% CA, 0% very major discrepancies.
  • Imipenem (excluding specific species): 29 mm critical diameter yielded 98.6% CA, 0% major discrepancies.
  • Other tested antibiotics did not meet FDA criteria.

Conclusions:

  • Disk diffusion DST is suitable for aminoglycosides and imipenem against Nocardia.
  • Excludes N. farcinica and N. cyriacigeorgica for imipenem.
  • Method shows potential for accurate Nocardia susceptibility categorization, despite unmet FDA criteria for some agents.