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Five (2 IgG, 3 IgM) monoclonal antibodies (MAbs) against the G9508KS strain of grouper nervous necrosis virus (GNNV) were produced and characterized. All 5 MAbs showed positive signals in the retina of GNNV-infected grouper larvae and in the cytoplasm of GNNV-infected GF-1 cells using immunohistochemistry staining. Two MAbs reacted with the denatured capsid protein derived from GNNV-infected GF-1 cells in Western blot analysis, but did not react with the GNNV recombinant capsid protein expressed by E. coli in an indirect immnunosorbent assay (ELISA). All 5 MAbs were able to neutralize GNNV, tiger puffer NNV (TPNNV) and barfin flounder NNV (BFNNV), while only 2 of the MAbs neutralized striped jack NNV (SJNNV). A capture ELISA system based on the use of MAbs for capture and a rabbit polyclonal antibody for detection was developed. When absorbance values higher than 0.5 were judged to be positive, the sensitivity of the capture ELISA system was 2.5 ng per well of purified GNNV protein or 6.5 x 10(4) TCID50 per well of GNNV supernatant from culture cells. This capture ELISA system could become a more specific and sensitive tool for NNV diagnosis in the field and in routine laboratories.

Production of monoclonal antibodies against grouper nervous necrosis virus (GNNV) and development of an antigen capture ELISA