Rapid and Visual Detection of Coxsackievirus A6 Using Reverse Transcription Multiple Cross Displacement Amplification...

Area of Science:

• Virology
• Molecular Diagnostics
• Biotechnology

Background:

• Coxsackievirus A6 (CVA6) is the primary cause of hand, foot, and mouth disease (HFMD) in young children.
• Recent CVA6 outbreaks highlight the urgent need for effective diagnostic tools, as no vaccines or antiviral treatments are currently available.

Purpose of the Study:

• To develop and evaluate a novel, rapid detection assay for CVA6.
• To assess the assay's sensitivity, specificity, and clinical performance compared to existing methods.

Main Methods:

• A CVA6 detection assay, CVA6-RT-MCDA-LFB, was developed by combining reverse transcription multiple cross displacement amplification (RT-MCDA) with a lateral flow biosensor (LFB).
• The assay utilized ten specific primers targeting the CVA6 VP1 gene.
• Clinical performance was validated using 70 anal swab and 42 throat swab samples.

Main Results:

• The CVA6-RT-MCDA-LFB assay achieved an analytical sensitivity of 33 copies per reaction.
• The assay demonstrated 100% specificity, with no cross-reactivity against other viral strains.
• Clinical evaluation showed 100% concordance with commercial quantitative real-time PCR (qRT-PCR).

Conclusions:

• The CVA6-RT-MCDA-LFB assay provides a rapid (under 1 hour), simple, and accurate method for CVA6 detection.
• Its high performance and speed make it a suitable Point-of-Care Testing (POCT) solution, particularly for resource-limited settings.