Acta Veterinaria et Zootechnica Sinica ›› 2025, Vol. 56 ›› Issue (8): 4086-4094.doi: 10.11843/j.issn.0366-6964.2025.08.045

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Preparation and Preliminary Application of Colloidal Gold Immunochromatographic Test Strip for Senecavirus A Antibody Detection

LI Shuaipeng1,2(), SHI Zhengwang2, CHEN Jie2, LUO Juncong2, ZHU Yuqian1,2, SHI Xintai2, XI Tao2, ZHANG Fan2, HE Yindi1,2, ZHENG Haixue1,2,*(), ZHANG Xiaoli1,*(), TIAN Hong2,*()   

  1. 1. College of Veterinary Medicine, Gansu Agricultural University, Lanzhou 730070, China
    2. State Key Laboratory of Animal Disease Prevention and Control, College of Animal Medicine and Biosecurity, Lanzhou University, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730000, China
  • Received:2024-09-10 Online:2025-08-23 Published:2025-08-28
  • Contact: ZHENG Haixue, ZHANG Xiaoli, TIAN Hong E-mail:2962386234@qq.com;zhenghaixue@caas.cn;zhxl228@qq.com;xibeitian0931@163.com

Abstract:

The aim of this study was to develop a rapid, accurate and easy-to-use colloidal gold assay for Senecavirus A (SVA) antibody diagnosis for Senecavirus infection. The recombinant protein of SVA VP2 was obtained by prokaryotic expression and purification, and the VP2 protein polyclonal antibody was prepared. The VP2 protein was coupled with colloidal gold to form a gold labeled antigen. Subsequently, VP2 protein and VP2 polyclonal antibody were coated on nitrocellulosic membrane (NC membrane) as test line (T-line) and control line (C-line), respectively. Optimizing the reaction system to prepare test strips. The results showed that the prepared test strips had no cross reactivity and good specificity when detecting foot-and-mouth disease virus (FMDV) serotypes O and A (FMDV-O, FMDV-A), porcine reproductive and respiratory syndrome virus (PRRSV), classical swine fever virus (CSFV), pseudorabies virus (PRV), African swine fever virus (ASFV) positive serum and healthy pig (SPF) serum; The sensitivity of SVA positive serum was 1 ∶64. The kappa value of the strip and virus neutralization test (VNT) was 0.88 in 150 swine clinical samples, indicating that the two methods were highly consistent. In summary, an SVA antibody test strip was successfully developed by this study, which can be operated in 10 to 15 minutes, and has the advantages of being rapid, accurate and simple, providing an effective tool for clinical qualitative detection and on-site diagnosis of Senecavirus disease.

Key words: Senecavirus antibodies, VP2 protein, colloidal gold immunochromatographic test strip

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