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Cryptococcus gattii infections.

Sharon C-A Chen1, Wieland Meyer2, Tania C Sorrell3

  • 1Marie Bashir Institute for Infectious Diseases and Biosecurity, University of Sydney, Sydney, NSW, Australia Centre for Infectious Diseases and Microbiology, Westmead Millennium Institute, Westmead, NSW, Australia Western Clinical School, Sydney Medical School, University of Sydney, Westmead, NSW, Australia Institute of Clinical Microbiology and Medical Research, Westmead, NSW, Australia.

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Cryptococcus gattii, a fungus related to Cryptococcus neoformans, shows diverse molecular types. Virulent strains likely originated in South America, impacting non-immunocompromised hosts and requiring specific antifungal treatments.

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Area of Science:

  • Mycology
  • Molecular Biology
  • Infectious Diseases

Background:

  • Cryptococcus gattii (C. gattii) is an emerging fungal pathogen.
  • Its taxonomy and phylogeny have been clarified by molecular techniques.
  • It diverged from Cryptococcus neoformans (C. neoformans) millions of years ago.

Purpose of the Study:

  • To review current understanding of C. gattii taxonomy, phylogeny, and virulence.
  • To compare C. gattii and C. neoformans virulence factors and disease manifestations.
  • To discuss clinical aspects, diagnostics, and treatment of C. gattii infections.

Main Methods:

  • Phylogenetic analysis using molecular techniques.
  • Genomic and transcriptomic studies.
  • Review of clinical data and treatment outcomes.

Main Results:

  • C. gattii likely originated in South America, with virulent VGII types emerging in North America.
  • Different C. gattii molecular types (VGI, VGII, VGIII) primarily affect non-immunocompromised hosts.
  • VGIIa and VGIIb subtypes exhibit distinct transcriptional circuits and virulence phenotypes, with VGII causing severe lung disease and C. neoformans causing meningoencephalitis.

Conclusions:

  • C. gattii poses a significant public health threat, particularly to non-immunocompromised individuals.
  • Early diagnosis and appropriate antifungal therapy are crucial for managing C. gattii infections.
  • Further research is needed to optimize treatment regimens, especially for fluconazole-resistant isolates.