Comparison of JEV neutralization assay using pseudotyped JEV with the conventional plaque-reduction neutralization...

Area of Science:

• Virology
• Immunology
• Assay Development

Background:

• Japanese Encephalitis Virus (JEV) poses a significant public health threat.
• Accurate measurement of JEV neutralizing antibodies (NAb) is crucial for vaccine efficacy assessment.
• The plaque-reduction neutralization test (PRNT) is the current standard but has limitations.

Purpose of the Study:

• To evaluate a novel pseudotyped-JEV (JEV-PV) assay system for measuring JEV NAb.
• To compare the JEV-PV assay's performance against the established PRNT.
• To determine the suitability of the JEV-PV assay as a replacement for PRNT.

Main Methods:

• Development of a JEV-PV based neutralization assay.
• Comparison of JEV-PV assay with PRNT for repeatability, reproducibility, and specificity.
• Correlation analysis of NAb titers obtained from both assay methods.

Main Results:

• The JEV-PV assay demonstrated simplicity, safety, and speed advantages over PRNT.
• Close correlation was observed between JEV-PV assay results and PRNT (50% plaque reduction method).
• All analytical acceptance criteria for validation were met.

Conclusions:

• The JEV-PV assay is a viable, safe, and simple alternative for measuring JEV NAb titers.
• This assay can serve as an effective method for assessing JEV neutralization potency.
• The JEV-PV assay shows potential as a new standard for JEV NAb evaluation.