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[Rapid identification methods of yeasts during fungaemia].

L Badenhorst1, P L Botha, M N van Rensburg

  • 1Departement Mediese Mikrobiologie, Universiteit van die Oranje-Vrystaat, Bloemfontein.

South African Medical Journal = Suid-Afrikaanse Tydskrif Vir Geneeskunde
|March 16, 1991
PubMed
Summary

Rapid yeast identification during fungemia is crucial. Modified methods like serum tests (95% accurate) and disc diffusion significantly speed up diagnosis, aiding timely treatment for yeast infections.

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Area of Science:

  • Medical Mycology
  • Clinical Microbiology
  • Infectious Diseases

Background:

  • Fungal bloodstream infections (fungemia) require rapid diagnosis for effective treatment.
  • Current yeast identification methods can be time-consuming, delaying patient management.
  • Optimizing diagnostic workflows is essential for improving outcomes in fungemia cases.

Purpose of the Study:

  • To evaluate the efficiency of a wet preparation method, a modified serum test, and a modified disc diffusion method for rapid yeast identification.
  • To compare the accuracy and speed of these methods in identifying yeasts from positive blood cultures.
  • To determine the most frequently isolated yeast species in fungemia cases.

Main Methods:

  • Evaluation of a wet preparation method for initial yeast detection.

Related Experiment Videos

  • Assessment of a modified serum test for rapid species identification.
  • Application of a modified disc diffusion method for identifying non-albicans yeast species.
  • Processing of 2,932 blood cultures to identify yeast isolates.

    • Main Results:

    • Candida albicans was identified within 3 hours after Gram stain confirmation of yeast growth.
    • The modified serum test demonstrated 95% accuracy in yeast identification.
    • Other yeast species were identified within 24 hours using the modified disc diffusion method.
    • Candida albicans (50%), Candida tropicalis (22%), and Candida parapsilosis (22%) were the most common isolates.
    • Fungemia was frequently associated with prior antimicrobial therapy and abdominal conditions.

    Conclusions:

    • The evaluated methods significantly accelerate yeast identification in fungemia.
    • The modified serum test offers high accuracy for rapid diagnosis.
    • Faster identification allows for quicker targeted therapy, potentially improving patient prognosis.