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Standardization of susceptibility testing methods

I Phillips1, A King

  • 1Division of Microbiology, United Medical and Dental School, London, UK.

Journal of Chemotherapy (Florence, Italy)
|May 1, 1997
PubMed
Summary
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Standardizing antibiotic susceptibility testing presents challenges due to issues with media, inoculum, and interpretation. While some advocate for universal methods, others believe diverse protocols can yield comparable results with careful adherence.

Area of Science:

  • Medical Microbiology
  • Clinical Laboratory Science

Background:

  • Standardization of antibiotic susceptibility testing (AST) is crucial for effective antimicrobial therapy.
  • Current AST methods face challenges related to optimal media, inoculum standardization, incubation conditions, and result interpretation.

Purpose of the Study:

  • To review the challenges and ongoing discussions in standardizing antibiotic susceptibility testing methods.
  • To explore different approaches to AST standardization, including universal adoption versus acceptance of diverse protocols.

Main Methods:

  • Review of current practices in antibiotic susceptibility testing.
  • Discussion of various manual and automated AST methodologies.
  • Analysis of differing viewpoints on standardization, including NCCLS guidelines.

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Main Results:

  • No single ideal medium or method for AST has been universally agreed upon.
  • Debate continues regarding optimal parameters such as inoculum size, disk content, incubation atmosphere, and reading/interpretation methods.
  • Both manual and automated systems are in use, with varying degrees of standardization.

Conclusions:

  • Achieving complete standardization in AST remains a significant challenge.
  • Different approaches exist, with some favoring universal method adoption and others supporting the compatibility of diverse, well-controlled protocols.
  • The interpretation of AST results in both microbiological and clinical contexts requires careful consideration regardless of the method used.