Perspectives on non-neoformans cryptococcal opportunistic infections
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Published on: December 2, 2022
Nichole Smith1, Matthew Sehring1, Jefferson Chambers1
1UICOMP Internal Medicine Residency Program.
Abstract:
Non-neoformans Cryptococcus species, including C. laurentii and C. albidus, have historically been classified as exclusively saprophytic. However, recent studies have increasingly implicated these organisms as the causative agent of opportunistic infections in humans. Herein, the case is presented of C. laurentii meningitis in a critically ill patient receiving corticosteroids. C. laurentii has been implicated in an additional 18 cases of opportunistic infection, predominantly of the skin, bloodstream, and central nervous system. The most clinically significant risk factors for non-neoformans cryptococcal infections include: impaired cell-mediated immunity, recent corticosteroid use, and invasive catheter placement. This article provides a comprehensive review of the clinical relevance, pathogenesis, risk factors, and treatment of non-neoformans Cryptococcus species.
Insights
Non-neoformans Cryptococcus species, historically saprophytic, are increasingly causing opportunistic infections in humans. Risk factors include weakened immunity and corticosteroid use, necessitating a review of these emerging pathogens.
Area of Science:
- Mycology
- Infectious Diseases
- Clinical Microbiology
Background:
- Non-neoformans Cryptococcus species (e.g., C. laurentii, C. albidus) were traditionally considered exclusively saprophytic.
- Emerging evidence highlights their role as opportunistic pathogens causing human infections.
- This shift necessitates a re-evaluation of their clinical significance.
Purpose of the Study:
- To present a case of C. laurentii meningitis in an immunocompromised patient.
- To review the clinical spectrum and risk factors of non-neoformans Cryptococcus infections.
- To provide a comprehensive overview of pathogenesis and treatment.
Main Methods:
- Case report of C. laurentii meningitis.
- Literature review of 18 additional opportunistic infections attributed to C. laurentii.
- Synthesis of data on risk factors, pathogenesis, and treatment.
Main Results:
- C. laurentii was identified as the causative agent of meningitis in a critically ill patient on corticosteroids.
- Non-neoformans Cryptococcus species were implicated in 18 other cases, primarily affecting skin, bloodstream, and CNS.
- Impaired cell-mediated immunity, corticosteroid use, and invasive catheters are key risk factors.
Conclusions:
- Non-neoformans Cryptococcus species represent a growing threat in opportunistic infections.
- Recognition of risk factors is crucial for early diagnosis and management.
- Further research into pathogenesis and treatment strategies is warranted.
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