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Evaluating clinical outcome in non-HIV associated cryptococcal meningitis with negative CSF culture using microscopic
1Department of Neurology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, PR China.
Diagnostic Microbiology and Infectious Disease
|June 13, 2025
Summary
For non-HIV associated cryptococcal meningitis (CM) patients with negative CSF cultures, a slow rate of cryptococcal clearance is a strong predictor of poor outcomes. Monitoring this clearance rate can help optimize patient management.
Area of Science:
- Infectious Diseases
- Neuroscience
- Medical Biomarkers
Background:
- Non-HIV associated cryptococcal meningitis (CM) lacks validated biomarkers for outcome prediction in patients with negative cerebrospinal fluid (CSF) cultures.
- While baseline CSF cryptococcal load correlates with progression, the prognostic value of cryptococcal clearance rate remains undetermined in this population.
Purpose of the Study:
- To investigate the association between the rate of cryptococcal clearance and clinical outcomes in non-HIV associated CM patients with negative CSF cultures.
- To identify potential biomarkers for assessing disease progression and treatment response in this specific patient group.
Main Methods:
- Retrospective analysis of data from 111 non-HIV associated CM patients with negative CSF cultures.
- Focus on analyzing the correlation between the rate of cryptococcal clearance (assessed by India ink staining) and patient outcomes at various time points (2 weeks, 10 weeks, 1 year).
Main Results:
- A high baseline log10 CSF cryptococcal count and a slow cryptococcal clearance rate were significantly associated with unsuccessful outcomes at 2 weeks.
- Both high baseline cryptococcal count and slow clearance rate, along with baseline hearing impairment, predicted unsuccessful outcomes at 10 weeks.
- Baseline hearing impairment and a high baseline log10 CSF cryptococcal count (≥1.52/ml) were associated with a lack of clinical cure within 1 year.
Conclusions:
- The rate of cryptococcal clearance, determined by India ink staining, shows potential as a short-term outcome marker in non-HIV associated CM patients with negative CSF cultures.
- Monitoring cryptococcal clearance may aid in optimizing clinical management for this challenging patient subgroup.
- The sustained prognostic value of cryptococcal clearance at 10 weeks highlights its importance, with the impact of baseline cryptococcal count diminishing over time.
