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Prokaryotic Expression of NS3 Protein of Duck tembusu virus and Establishment and Application of Its Indirect ELISA Detection Method |
AN Er-Li1,2,3,4, JI Xin-Qin1,2,*, RUAN Yong1,3,4,*, CHEN Ze-Hui1,2,3,4, CAO Wei1,2,3,4, WANG Han-Han1,2,3,4, LUO Xiao-Yu1,2,3,4, LONG Dan-Dan1, CHEN Jia-Qi1,2, YANG Chun-Pei5, WU Zong-Hao5, WANG Li-Juan5, YAO Bi-Qiong5 |
1 Faculty of Animal Sciences, GuiZhou University, Guiyang 550025, China; 2 Guizhou Institute of Animal Disease, GuiZhou University, Guiyang 550025, China; 3 Key Laboratory of Plateau Mountain Animal Genetics, Breeding and Reproduction, Ministry of Education, Guizhou University, Guiyang 550025, China; 4 Key Laboratory of Animal Genetics, Breeding and Reproduction, Guiyang 550025, China; 5 County Animal Disease Prevention and Control Center, Sansui 556500, China |
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Abstract To develop an indirect ELISA method for rapid detection of Duck tembusu virus (DTMUV) antibodies, in this study, the prokaryotic recombinant expression vector pET-28a-NS3 was constructed, and NS3 protein obtained through induced expression was used as the coated antigen. After optimizing a series of conditions, an indirect ELISA method for detecting DTMUV antibodies was established. Antibody analysis was performed on 30 serum samples for challenge test and 150 collected serum samples by the established ELISA method. The results showed that the intra-assay coefficient of variation and the coefficient of variation (CV) of the indirect ELISA method was 1.49%~4.31% and 1.22%~6.07%, respectively, which met the national standard. DTMUV antibody could be specifically detected by this method. And the indirect ELISA method had no cross-reaction with Avian influenza virus (AIV) H5 subtype, AIV H7 subtype, Newcastle disease virus (NDV), Duck Circovirus (DuCV) and Duck hepatitis A virus (DHAV-1) positive sera. The coincidence rate of positive and negative detection numbers of challenge test samples and commercial kit was 100%, and the coincidence rate of positive and negative detection numbers of farm samples and commercial kit was 97.33%. In summary, the DTMUV NS3 protein antibody indirect ELISA method established in this study has good specificity and repeatability, and provides a rapid and effective detection method for the investigation of DTMUV epidemiological situation.
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Received: 23 October 2023
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Corresponding Authors:
* jxq972@aliyun.com;ruan_yong@126.com
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