Oxygen-Vacancy-Engineered WO X Nanowire-Based Surface-Enhanced Raman Scattering Biosensor with Lyophilized CRISPR/Cas13a Platform for CHIKV Detection

The outbreak of Chikungunya virus (CHIKV) has caused widespread acute morbidity with severe polyarthralgia or chronic arthritis, placing a great challenge to public health and socioeconomic development. Establishing a rapid and highly sensitive detection technology is crucial for achieving precise control and prevention. Here, we established a CRISPR/Cas13a-mediated SERS lateral flow immunoassay platform for rapid and highly sensitive detection of CHIKV. One-dimensional nanowires loading Au nanoparticles were used to prepare SERS tags, presenting excellent SERS-enhanced performances and superior applicability to directional flow on the test strip. For the best performance, the structure of WOX nanowires was regulated by adjusting the addition concentration of ascorbic acid during the synthesis process, resulting in a stronger LSPR effect derived from more Au NPs in situ grown on highly reducing WOX. Furthermore, the lyophilized CRISPR/Cas system greatly simplified the workflow. In the optimal conditions, the limit of detection reached 0.56 and 1.03 copies/μL for the CHIKV plasmid and inactivated viruses by this method, respectively. Furthermore, 34 clinical serum samples were accurately diagnosed by our proposed method, 100% consistent with qPCR. This platform with the advantages of simple operation and rapid response provides a reliable technical tool for the early precise identification and efficient monitoring of CHIKV.