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CrAg lateral flow assay for cryptococcosis.

Thomas R Kozel¹, Sean K Bauman

¹University of Nevada School of Medicine, Department of Microbiology and Immunology , 320, Reno, NV, 89557-0320 , USA +1 775 784 4124 ; +1 775 327 2332 ; tkozel@medicine.nevada.edu.

Expert Opinion on Medical Diagnostics

|March 14, 2013

Summary

A new cryptococcal antigen lateral flow immunoassay (CrAg LFA) offers rapid, affordable diagnosis for cryptococcal meningitis, a leading cause of death in AIDS patients, especially in resource-limited settings.

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Area of Science:

Infectious Diseases
Immunology
Medical Diagnostics

Background:

Cryptococcal meningitis is a significant global health threat, particularly for individuals with AIDS.
It causes more deaths than tuberculosis in sub-Saharan Africa and affects immunosuppressed patients worldwide.
Early diagnosis is critical for effective treatment, especially in resource-limited areas.

Purpose of the Study:

To review the need for improved diagnostics for cryptococcal meningitis.
To describe the features of an ideal diagnostic tool.
To introduce and evaluate a new lateral flow immunoassay (LFA) for cryptococcal antigen (CrAg).

Main Methods:

Literature review on diagnostic needs for cryptococcal meningitis.
Description of the design of a novel CrAg LFA.

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Presentation of initial clinical evaluation results of the CrAg LFA.

Main Results:

The CrAg LFA enables rapid and inexpensive diagnosis of cryptococcosis.
It is suitable for use at or near the point of care.
Initial evaluations demonstrate its clinical utility.

Conclusions:

The CrAg LFA is recommended for diagnosing cryptococcal meningitis and non-meningeal cryptococcosis in symptomatic patients using serum, plasma, or CSF.
Further evaluation is needed for screening asymptomatic patients.
The LFA shows promise for screening ART-naive adults with low CD4 counts in high-prevalence areas to identify candidates for preemptive antifungal therapy.