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Correlation between serum cryptococcal antigen titre and meningitis in immunocompetent patients
Ian Gassiep1,2, Chaw Aye3, Mark Armstrong2,1
12School of Medicine, James Cook University, Douglas 4814, Australia.
Journal of Medical Microbiology
|August 24, 2018
Summary
Higher serum cryptococcal antigen (CRAG) levels correlate with cryptococcal meningitis in immunocompetent individuals. This finding aids diagnosis, especially in resource-limited settings.
Area of Science:
- Infectious Diseases
- Clinical Microbiology
- Immunology
Background:
- Cryptococcal meningitis is a serious infection, particularly in immunocompromised individuals.
- Diagnosis in immunocompetent patients can be challenging.
- Serum cryptococcal antigen (CRAG) is a key diagnostic marker.
Purpose of the Study:
- To determine the correlation between serum CRAG levels and the diagnosis of cryptococcal meningitis.
- To evaluate the utility of serum CRAG in immunocompetent patients.
- To assess the diagnostic value of serum CRAG in specific clinical scenarios.
Main Methods:
- Retrospective multicentre analysis of immunocompetent patients diagnosed with cryptococcal meningitis (2000-2017).
- Comparison of serum CRAG titres between meningitis and non-meningitis patient groups.
- Calculation of relative risk for meningitis based on serum CRAG levels.
Main Results:
- Serum CRAG titres were significantly higher in patients with meningitis (1:256) compared to non-meningitis cases (1:64) (P=0.012).
- A serum CRAG titre >1:64 indicated a 1.8-fold increased relative risk of meningitis.
- A clear correlation was established between serum CRAG titre and meningitis diagnosis.
Conclusions:
- Serum CRAG titre shows a significant correlation with cryptococcal meningitis in immunocompetent patients.
- Elevated serum CRAG may assist in diagnosing meningitis, particularly when lumbar puncture is not feasible.
- This evidence supports the use of serum CRAG in guiding therapeutic decisions in resource-limited settings.
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