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Related Experiment Videos

Rapid identification of Staphylococcus epidermidis.

G L Woods, G S Hall, I Rutherford

    American Journal of Clinical Pathology
    |April 1, 1987
    PubMed
    Summary

    A Minitek sugar disk panel accurately identifies Staphylococcus epidermidis (SE) from blood cultures. This cost-effective method provides reliable results within five hours for clinical microbiology.

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    Area of Science:

    • Clinical Microbiology
    • Bacteriology
    • Diagnostic Methods

    Background:

    • Accurate identification of Staphylococcus epidermidis (SE) is crucial for managing bloodstream infections.
    • Coagulase-negative staphylococci (CNS) comprise a diverse group, necessitating reliable differentiation methods.
    • Current identification methods can be time-consuming or expensive for routine clinical laboratories.

    Purpose of the Study:

    • To evaluate the efficacy of a Minitek sugar disk panel for identifying Staphylococcus epidermidis (SE) from blood culture isolates.
    • To assess the sensitivity, specificity, and predictive values of the Minitek panel for SE identification.
    • To determine the time required for accurate differentiation of SE from other CNS.

    Main Methods:

    • A Minitek sugar disk panel (trehalose, mannitol, xylose, sucrose) was utilized.
    • Organisms were suspended in Mueller-Hinton broth and inoculated onto disks in a microtiter tray.
    • Incubation was performed in a non-CO2 moist chamber at 35°C, with readings at 5 and 24 hours.

    Main Results:

    • The panel demonstrated high performance in differentiating SE from other CNS among 227 isolates.
    • At 5 hours, sensitivity was 94%, specificity 92%, positive predictive value 97%, and negative predictive value 84%.
    • At 24 hours, sensitivity was 96%, specificity 89%, positive predictive value 96%, and negative predictive value 87%.

    Conclusions:

    • The Minitek sugar disk panel is an effective, inexpensive, and convenient method for rapid identification of SE.
    • The panel provides accurate results within a 5-hour incubation period, facilitating timely clinical decisions.
    • This diagnostic approach aids in distinguishing SE from other coagulase-negative staphylococci in blood cultures.

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