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Update on the diagnosis, pathophysiology and treatment strategies in non-HIV-associated cryptococcal
Terri Lynne Scott1, Martha Quezado2, Peter Richard Williamson1
1Translational Mycology Section, Laboratory of Clinical Immunology and Microbiology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA.
Introduction:
Cryptococcal meningoencephalitis (CM) is the leading cause of non-viral meningitis in the United States, reflecting both the rise in immunocompromised populations and the prevention of bacterial meningitis through vaccination. Formerly linked primarily to HIV-associated immunodeficiency, effective antiretroviral therapy has reshaped CM epidemiology: solid-organ transplant recipients and apparently healthy individuals now constitute the main risk groups, with mortality remaining 30-40%.
Areas Covered:
This review synthesizes emerging evidence on post-infectious inflammatory syndromes complicating CM, highlighting new insights into their pathogenesis, clinical recognition, and management. It also examines advances in rapid diagnostic approaches aimed at accelerating detection and guiding targeted therapy. Literature was identified through PubMed/MEDLINE and Embase searches, as detailed in the Introduction.
Expert Opinion:
Persistently high CM mortality stems from delayed or missed diagnosis and under-recognized post-infectious inflammatory injury. Current antifungal regimens, although microbiologically effective, are limited by toxicity and poor tolerability. Improving outcomes will require the integration of rapid, sensitive diagnostic tools for both acute infection and inflammatory sequelae, alongside development of safer, orally bioavailable antifungal agents. These strategies offer the greatest potential to reduce mortality, preserve neurological function, and improve the long-term clinical course of this devastating disease.
Insights
Cryptococcal meningoencephalitis (CM) remains a significant threat, particularly in immunocompromised individuals. Early diagnosis and novel treatments are crucial to reduce high mortality and neurological damage from this serious infection.
Area of Science:
- Infectious Diseases
- Neurology
- Immunology
Background:
- Cryptococcal meningoencephalitis (CM) is a leading cause of non-viral meningitis in the US.
- Epidemiology has shifted from HIV-associated cases to solid-organ transplant recipients and immunocompetent individuals.
- Mortality rates for CM remain high at 30-40%.
Purpose of the Study:
- To review emerging evidence on post-infectious inflammatory syndromes in CM.
- To highlight advances in rapid diagnostics for CM.
- To discuss strategies for improving CM management and outcomes.
Main Methods:
- Literature search of PubMed/MEDLINE and Embase databases.
- Synthesis of emerging evidence on CM pathogenesis, diagnosis, and treatment.
- Analysis of current diagnostic and therapeutic limitations.
Main Results:
- Post-infectious inflammatory syndromes complicate CM and contribute to mortality.
- Current antifungal regimens have limitations in toxicity and tolerability.
- Rapid diagnostic tools are advancing for earlier detection and targeted therapy.
Conclusions:
- Improving CM outcomes requires integrating rapid diagnostics with novel, safer antifungal agents.
- Addressing delayed diagnosis and inflammatory injury is key to reducing mortality.
- Enhanced management strategies can preserve neurological function and improve long-term prognosis.
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