Rapid detection of Seneca Valley virus based on reverse transcription recombinase polymerase amplification and CRISPR-Cas13a.

The Seneca Valley virus (SVV) is an emerging novel etiological agent that triggers vesicular stomatitis in pigs. SVV leads to considerable financial detriment to the global swine industry. Availability of expeditious, simple, and precise detection techniques would aid in the diagnosis and control of Seneca Valley disease. In this study, we developed a novel SVV detection assay based on reverse transcription recombinase polymerase amplification (RT-RPA)/CRISPR-Cas13a. This technique can specifically identify SVV with no cross-reactivity with other viruses, such as the porcine reproductive and respiratory syndrome virus, pseudorabies virus, classical swine fever virus, and foot-and-mouth disease virus. It boasts a detection threshold as sensitive as 2.43 copies/μL, matching the proficiency of reverse transcriptase quantitative PCR in clinical diagnostics. The streamlined RT-RPA/CRISPR-Cas13a assay for SVV minimizes procedural complexity and the likelihood of contamination. Integrating this method with nucleic acid acquisition via nucleic acid releaser enables a turnaround time of only 40 min from sample acquisition to result determination, underscoring its suitability for on-site diagnostics and affirming its role as a robust instrument for the monitoring and detection of SVV.