The dengue 4 virus (DEN-4) core gene and part of the PreM genes were inserted into the baculovirus polyhedrin gene region. The recombinant baculovirus directed the synthesis of the DEN-4 core protein fused to a part of the polyhedrin protein ( 25K), as determined by Western blot analysis using DEN-4 core monoclonal antibody. A mouse polyclonal antibody prepared against the DEN-4 core fusion protein showed antigenic reactivity with the authentic DEN-4 core protein ( 15.5K) present in the nucleus as well as in the cytoplasm of DEN-4-infected Vero cells as demonstrated by the peroxidase-antiperoxidase staining method. This antibody did not react with cells infected with DEN-1, -2, -3 or Japanese encephalitis virus, or mock-infected cells.


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