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Variation from standards in Staphylococcus aureus susceptibility testing.

M A Pfaller, D S Wakefield, G T Hammons

    American Journal of Clinical Pathology
    |August 1, 1987
    PubMed
    Summary
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    Many Veterans Affairs labs show variation in methicillin-resistant Staphylococcus aureus (MRSA) testing methods. Adherence to guidelines for MRSA detection is suboptimal, potentially impacting accurate identification.

    Area of Science:

    • Clinical Microbiology
    • Infectious Diseases
    • Antimicrobial Resistance

    Background:

    • Methicillin-resistant Staphylococcus aureus (MRSA) poses a significant public health threat.
    • Standardized susceptibility testing is crucial for effective MRSA detection and patient management.

    Purpose of the Study:

    • To evaluate methodologic variations in MRSA detection practices.
    • To assess adherence to current guidelines for MRSA susceptibility testing within the Veterans Administration (VA) system.

    Main Methods:

    • A survey of 162 microbiology laboratories in the VA system.
    • Analysis of returned questionnaires from 136 (84%) laboratories regarding their MRSA detection methods.

    Main Results:

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  • Disk diffusion (71%), manual broth dilution (40%), and automated methods (26%) were utilized for MRSA detection.
  • Reported MRSA detection rates varied widely (0-52%), with a mean of 10%.
  • Fewer than 60% of laboratories adhered to guidelines for inoculum preparation, incubation, and medium supplementation.

    • Conclusions:

    • Significant methodologic variation exists in MRSA susceptibility testing across VA laboratories.
    • Suboptimal adherence to established guidelines may compromise the accurate detection of MRSA.