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Related Experiment Videos

Cryptococcosis in apparently immunocompetent patients.

G Lui1, N Lee, M Ip

  • 1Division of Infectious Diseases, Department of Medicine and Therapeutics, 9/F Clinical Sciences Building, Prince of Wales Hospital, Hong Kong.

QJM : Monthly Journal of the Association of Physicians
|March 1, 2006
PubMed
Summary

Cryptococcosis affects immunocompetent individuals, often presenting as indolent meningitis with better outcomes. This fungal infection requires careful diagnosis and management in all patient groups.

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Area of Science:

  • Infectious Diseases
  • Mycology
  • Clinical Microbiology

Background:

  • Cryptococcosis is a fungal infection with limited reported data on immunocompetent patients.
  • Understanding cryptococcosis in immunocompetent individuals is crucial due to its potential impact.

Purpose of the Study:

  • To compare the clinical presentations and outcomes of cryptococcosis between immunocompetent and immunocompromised patients.
  • To identify differences in disease manifestation and prognosis based on immune status.

Main Methods:

  • A retrospective case series of 46 confirmed cryptococcosis cases in Hong Kong hospitals (1995-2005).
  • Data collected included clinical presentations, fungemia rates, cerebrospinal fluid (CSF) parameters, and outcomes.
  • Cases were categorized into immunocompetent, immunocompromised (non-HIV), and HIV-positive groups.

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Main Results:

  • Nearly half (43.5%) of patients were immunocompetent, with *Cryptococcus gattii* being a common cause in this group.
  • Immunocompetent patients more frequently presented with meningitis (80.0%) and showed a trend towards lower fungemia (10.0%) and mortality rates (25.0%).
  • In cryptococcal meningitis, immunocompetent patients experienced longer onset-to-presentation times, more intense inflammatory responses, less fungemia, and better clinical outcomes (81.3%) compared to immunocompromised patients (46.7%).

Conclusions:

  • A significant portion of cryptococcosis cases occur in apparently immunocompetent individuals.
  • Both *Cryptococcus neoformans* var. *grubii* and *Cryptococcus gattii* are identified as common causative agents.
  • Immunocompetent patients typically exhibit localized, indolent neurological disease with robust inflammatory responses but favorable prognoses.