Duplex real-time RT-PCR assay for detection and subgroup-specific identification of human respiratory syncytial virus

Area of Science:

• Virology
• Molecular Biology
• Public Health

Background:

• Human respiratory syncytial virus (HRSV) causes significant acute respiratory illness in young children globally.
• Accurate detection of HRSV subgroups A and B is vital for disease burden assessment, especially with new vaccines and immunotherapies emerging.
• Evolving HRSV strains necessitate updated molecular diagnostic assays for reliable detection.

Purpose of the Study:

• To develop and validate a novel, subgroup-specific real-time RT-PCR (rRT-PCR) assay for HRSV detection and identification.
• To ensure the assay targets conserved regions of the nucleoprotein gene using current genomic data.
• To provide a reliable tool for differentiating HRSV subgroups A and B.

Main Methods:

• Developed a duplex rRT-PCR assay using primers and subgroup-specific probes targeting the HRSV nucleoprotein gene.
• Utilized comprehensive GenBank genome sequence data for assay design.
• Validated analytical sensitivity, specificity, reproducibility, and clinical performance against a reference pan-HRSV rRT-PCR test.

Main Results:

• The assay demonstrated high analytical sensitivity, detecting as few as 5-10 copies/reaction of target RNA.
• Specificity was confirmed, with no cross-amplification observed for 16 other common respiratory pathogens.
• In silico analysis further supported the assay's specificity.
• Clinical validation showed reliable performance with diverse viral isolates and respiratory specimens.

Conclusions:

• The developed duplex rRT-PCR assay offers rapid, sensitive, and specific detection and subgroup identification of HRSV.
• This assay, based on current genomic data, is a valuable tool for monitoring HRSV infections and supporting public health initiatives.
• The assay's reliability is crucial for accurate disease burden estimates and the evaluation of HRSV interventions.