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Related Experiment Videos

Repeat antimicrobial susceptibility testing of identical isolates.

R B Thomson1, T M File, R A Burgoon

  • 1Department of Pathology, Akron City Hospital, Ohio 44309.

Journal of Clinical Microbiology
|May 1, 1989
PubMed
Summary

Repeat antimicrobial susceptibility testing is not always necessary for Staphylococcus aureus. However, coagulase-negative staphylococci and Pseudomonas aeruginosa require repeat testing, as do Enterobacteriaceae after 3 days.

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Clinical microbiology and infection : the official publication of the European Society of Clinical Microbiology and Infectious Diseases·2006

Area of Science:

  • Clinical Microbiology
  • Infectious Diseases
  • Antimicrobial Stewardship

Background:

  • Antimicrobial susceptibility testing (AST) is crucial for guiding effective antibiotic therapy.
  • Optimizing AST protocols can improve laboratory efficiency and reduce healthcare costs.
  • Determining the necessity of repeat testing for sequential isolates is key to efficient antimicrobial stewardship.

Purpose of the Study:

  • To evaluate the necessity of repeat antimicrobial susceptibility testing for sequential bacterial isolates.
  • To establish evidence-based guidelines for repeat AST in a clinical microbiology setting.

Main Methods:

  • Retrospective review of duplicate antimicrobial susceptibility test results over a one-year period.
  • Analysis focused on sequential isolates from the same patient and specimen site with identical identification.

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  • Categorization of bacterial pathogens based on institutional repeat testing protocols.

    • Main Results:

    • Repeat antimicrobial susceptibility testing is routinely necessary for coagulase-negative staphylococci and Pseudomonas aeruginosa.
    • Repeat testing for Enterobacteriaceae is indicated after a 3-day interval.
    • Routine repeat testing is not necessary for Staphylococcus aureus isolates.

    Conclusions:

    • AST protocols can be refined to avoid unnecessary repeat testing, particularly for Staphylococcus aureus.
    • Implementing tailored repeat testing strategies optimizes resource utilization in clinical microbiology.
    • Evidence supports differentiating repeat AST requirements based on specific bacterial species.