Evaluation of a Commercial Multiplex Molecular Panel for Diagnosis of Infectious Meningitis and Encephalitis

Area of Science:

• Clinical Microbiology
• Infectious Diseases
• Molecular Diagnostics

Background:

• Timely diagnosis of central nervous system infections is critical for effective treatment.
• Multiplex molecular panels offer a rapid and comprehensive approach to pathogen detection.

Purpose of the Study:

• To evaluate the performance characteristics of the FilmArray meningitis/encephalitis (ME) panel for detecting pathogens in cerebrospinal fluid (CSF).
• To assess the accuracy of the ME panel compared to routine diagnostic methods.

Main Methods:

• Clinical evaluation of 291 residual CSF samples using the FilmArray ME panel.
• Comparison of ME panel results against established methods like bacterial culture and real-time PCR.
• Analysis of performance for bacterial, viral, and fungal pathogens, including *Cryptococcus neoformans/C. gattii*.

Main Results:

• The FilmArray ME panel demonstrated high percent positive agreement (PPA) for bacterial (97.5%) and viral (90.1%) pathogens.
• Overall PPA for *Cryptococcus neoformans/C. gattii* was 52% compared to antigen testing.
• Direct comparison to fungal smear or culture showed a PPA of 92.3% for *Cryptococcus neoformans/C. gattii*.

Conclusions:

• The FilmArray ME panel provides a rapid (approx. 60-minute) and effective syndrome-based diagnostic tool for meningitis and encephalitis.
• The panel shows excellent performance for bacterial and viral pathogen detection in CSF.
• While further optimization may be needed for certain fungal targets, the ME panel is a valuable addition to the diagnostic armamentarium.