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Isolation of saprophytic Cryptococcus neoformans.

M Pal1, C Onda, A Hasegawa

  • 1Department of Veterinary Internal Medicine, Faculty of Agriculture, University of Tokyo, Japan.

Nihon Juigaku Zasshi. the Japanese Journal of Veterinary Science
|December 1, 1990
PubMed
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Cryptococcus neoformans was isolated from banana and potato, highlighting new environmental sources for this pathogen. Sunflower seed agar proved more effective than Sabouraud dextrose agar for isolation.

Area of Science:

  • Medical Mycology
  • Environmental Microbiology
  • Plant Pathology

Background:

  • Cryptococcus neoformans is an opportunistic fungal pathogen causing cryptococcosis.
  • Identifying environmental niches is crucial for understanding C. neoformans transmission.
  • Previous studies have primarily focused on avian excreta as a source.

Purpose of the Study:

  • To investigate the prevalence of Cryptococcus neoformans in various environmental substrates.
  • To evaluate the efficacy of sunflower seed agar (SFA) and Sabouraud dextrose agar (SDA) for isolating C. neoformans.
  • To report the novel isolation of C. neoformans from banana fruits.

Main Methods:

  • Environmental samples including fruits, avian excreta, vegetables, and wooden scrapings were collected.

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  • Samples were cultured on sunflower seed agar (SFA) and Sabouraud dextrose agar (SDA) with chloramphenicol.
  • Isolates were identified based on colony morphology and yeast characteristics.

    • Main Results:

    • Three environmental specimens yielded positive isolations of C. neoformans.
    • Positive isolations were from two banana (Musa sapientum) fruits and one potato tuber (Solanum tuberosum).
    • Sunflower seed agar (SFA) successfully cultured all three isolates, while SDA with chloramphenicol was overgrown with contaminants and yielded no positive results.

    Conclusions:

    • Banana fruits represent a newly identified environmental source for Cryptococcus neoformans.
    • Sunflower seed agar (SFA) is a more effective medium for isolating C. neoformans from environmental samples compared to SDA with chloramphenicol, especially in contaminated settings.
    • Further ecological surveys are recommended to identify the environmental niches of C. neoformans var. neoformans and C. neoformans var. gattii.