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Related Experiment Videos

Screening protocol for Torulopsis (Candida) glabrata

G Land1, J Burke, C Shelby

  • 1Clinical Microbiology, Laboratory, Methodist Medical Center, Dallas, Texas 75203, USA.

Journal of Clinical Microbiology
|September 1, 1996
PubMed
Summary
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A new screening test accurately identifies Torulopsis (Candida) glabrata in clinical settings. This method, using trehalose fermentation, offers high efficiency and cost savings for laboratories handling yeast isolates.

Area of Science:

  • Clinical Microbiology
  • Medical Mycology
  • Diagnostic Laboratory Science

Background:

  • Torulopsis (Candida) glabrata is a common yeast isolate in clinical laboratories.
  • Accurate and efficient identification of T. glabrata is crucial for patient management and laboratory workflow.
  • Existing identification methods can be time-consuming or costly.

Purpose of the Study:

  • To develop and validate a presumptive screening test for T. glabrata.
  • To assess the efficacy of a protocol combining morphology and trehalose fermentation at 42°C.
  • To compare the screening test's performance against established commercial identification systems.

Main Methods:

  • An interlaboratory comparison was conducted using a protocol of cornmeal Tween 80 agar morphology and trehalose fermentation at 42°C.

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  • The screening test was applied to 517 clinical yeast isolates, including 241 T. glabrata.
  • Results were compared with final identifications from API20C Yeast Identification System and Rapid Yeast Identification Panel.

    • Main Results:

    • The trehalose screening test demonstrated high accuracy with 97.8% sensitivity and 95.8% specificity.
    • Positive and negative predictive values were 97.4% and 96.5%, respectively.
    • The overall efficiency for ruling in or out T. glabrata was 93.9%.

    Conclusions:

    • The developed screening test provides a reliable and efficient method for the presumptive identification of T. glabrata.
    • This method can significantly reduce direct and indirect costs in clinical laboratories.
    • The protocol is effective in differentiating T. glabrata from other common clinical yeast isolates.