Quantum dot fluorescent microsphere-based immunochromatographic strip for detecting PRRSV antibodies.

Abstract

Porcine reproductive and respiratory syndrome (PRRS) is an immunosuppressive disease caused by the porcine reproductive and respiratory syndrome virus (PRRSV). Current vaccine prevention and treatment approaches for PRRS are not adequate, and commercial vaccines do not provide sufficient cross-immune protection. Therefore, establishing a precise, sensitive, simple, and rapid serological diagnostic approach for detecting PRRSV antibodies is crucial. The present study used quantum dot fluorescent microspheres (QDFM) as tracers, covalently linked to the PRRSV N protein, to develop an immunochromatography strip (ICS) for detecting PRRSV antibodies. Monoclonal antibodies against PRRSV nucleocapsid (N) and membrane (M) proteins were both coated on nitrocellulose membranes as control (C) and test (T) lines, respectively. QDFM ICS identified PRRSV antibodies under 10 min with high sensitivity and specificity. The specificity assay revealed no cross-reactivity with the other tested viruses. The sensitivity assay revealed that the minimum detection limit was 1.2 ng/mL when the maximum dilution was 1:2,048, comparable to the sensitivity of enzyme-linked immunosorbent assay (ELISA) kits. Moreover, compared to PRRSV ELISA antibody detection kits, the sensitivity, specificity, and accuracy of QDFM ICS after analyzing 189 clinical samples were 96.7%, 97.9%, and 97.4%, respectively. Notably, the test strips can be stored for up to 6 months at 4 °C and up to 4 months at room temperature (18-25 °C). In conclusion, QDFM ICS offers the advantages of rapid detection time, high specificity and sensitivity, and affordability, indicating its potential for on-site PRRS screening. KEY POINTS: • QDFM ICS is a novel method for on-site and in-lab detection of PRRSV antibodies • Its sensitivity, specificity, and accuracy are on par with commercial ELISA kits • QDFM ICS rapidly identifies PRRSV, aiding the swine industry address the evolving virus.

• Authors: Rui Yang, Yi Ru, Huibao Wang, Rongzeng Hao, Yajun Li, Tao Zhang, Haixue Zheng, Yong Zhang, Xingxu Zhao
• Journal: Applied microbiology and biotechnology (Appl Microbiol Biotechnol) Vol. 108 Issue 1 Pg. 283 (Apr 04 2024) ISSN: 1432-0614 [Electronic] Germany
• PMID: 38573435 (Publication Type: Journal Article)
• Copyright: © 2024. The Author(s).

Chemical References

• Coloring Agents
• Antibodies, Viral

Topics

• Animals
• Swine
• Microspheres
• Quantum Dots
• Porcine respiratory and reproductive syndrome virus
• Porcine Reproductive and Respiratory Syndrome (diagnosis)
• Coloring Agents
• Antibodies, Viral
• Chromatography, Affinity