Sensitivity and Cross-Reactivity Analysis of Serotype-Specific Anti-NS1 Serological Assays for Dengue Virus Using...

Area of Science:

• Immunology and Infectious Diseases
• Biotechnology and Biosensing

Background:

• Dengue virus (DENV) is a significant global health threat, with millions of cases reported annually.
• Accurate serological assays are crucial for DENV surveillance, clinical management, and vaccine development.
• Current assays face limitations in specificity, sensitivity, and cross-reactivity, hindering precise diagnosis.

Purpose of the Study:

• To develop highly sensitive and quantitative serotype-specific anti-DENV NS1 IgG assays using optical modulation biosensing (OMB) technology.
• To evaluate the performance of these novel assays, including sensitivity, specificity, and cross-reactivity with other flaviviruses.

Main Methods:

• Developed OMB-based serological assays utilizing non-structural protein 1 (NS1) antigens from DENV-1-3.
• Assessed assay performance using samples from endemic (Vietnam) and non-endemic (Israel) regions.
• Evaluated intra-DENV serotype specificity and inter-Flavivirus cross-reactivity with Zika, Japanese encephalitis, and West Nile viruses.

Main Results:

• OMB-based assays demonstrated high sensitivity (~100% for homologous serotype) and a wide dynamic range (~4-log).
• Low detection limits (~400 ng/L) and rapid turnaround time (1.5 hours) were achieved.
• Inter-Flavivirus cross-reactivity was observed (21%-65%), correlating with NS1 antigen conservation.

Conclusions:

• Developed OMB-based assays offer a promising tool for sensitive, quantitative, and serotype-specific detection of anti-DENV IgG.
• Findings provide insights into DENV NS1 antigen cross-reactivity, important for diagnostic assay development.
• OMB technology holds potential for improved DENV epidemiological studies and diagnostic precision.