Development of indirect immunofluorescence assay for TCID50 measurement of grass carp reovirus genotype II without cytopathic effect onto cells

文献类型： 外文期刊

第一作者： Wang, Qing

作者： Wang, Qing;Xie, Hualiang;Zeng, Weiwei;Liu, Chun;Wu, Jiexing;Wang, Yingying;Li, Yingying;Xie, Hualiang;Wang, Linchuan;Bergmann, Sven M.

作者机构：

关键词： Immunofluorescence assay;TCID50;qPCR;Grass carp reovirus;Genotype II;Cyenopharyngodon idellus

期刊名称：MICROBIAL PATHOGENESIS （ 影响因子：3.738； 五年影响因子：3.663 ）

ISSN： 0882-4010

年卷期： 2018 年 114 卷

页码：

收录情况： SCI

摘要： Grass carp reovirus (GCRV) caused severe hemorrhagic disease with significant losses of fingerling and yearling grass carp, Cyenopharyngodon idellus, in southeast Asian. It was first isolated in 1983 in China, and Glade analysis of the different GCRV isolates indicates there are at least three different genotypes I, II, and III. In recent years, GCRV genotype II has been determined as a dominant virus type which cause severe obvious clinical signs in fish but no cytopathic effect onto presently available cell culture. TCID50 is one of standard method to quantity infectious virus particles. In the present study, an indirect immunofluorescence assay (IFA) was developed using antibody against a protein encoded by segment 10 of GCRV genotype II. Moreover, the specific assay to differentitate GCRV of different genotypes and a sensitive assay for determination of GCRV genotype II were developed respectively. The results showed the IFA only can recognize genotype II virus at the lowest initial concentration of 550 genomic copies/ml. Furthermore, comparison of results obtained from qPCR and the TCID50 assay combined IFA was conducted. The results indicated that TCID50 of GCRV isolates JX0901 and HZ08 differs with 2 log steps reduction in the numbers of viruses compared with the number of genome copies detected by qPCR. The immunofluorescence assay developed is sensitive, specific, and the TCID50 combined with IFA will be a standardizable technique for the quantitation and detection of infectious GCRV in cell culture without cytolysis.

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