Abstract
A new recombinant adenovirus was constructed that expressed the nucleocapsid (C protein or p14) of the bovine viral diarrhea virus (BVDV) under the control of a tetracycline-regulatable promoter. Mice covaccinated with this recombinant adenovirus, accompanied by another recombinant adenovirus expressing the trans-activator protein, induced a strong humoral immune response to the BVDV/C protein as detected by ELISA. Splenocytes from mice immunized with the recombinant adenovirus showed a specific proliferation response to both genotypes (type 1 and 2) of BVDV. High levels of IFN-γ were detected in the supernatant of murine mononuclear cells of mice immunized by the recombinant adenovirus when stimulated in vitro by both genotypes of BVDV. These results indicate that this recombinant adenovirus is highly immunogenic and stimulates both cellular and humoral immune responses against the nucleocapsid of BVDV.
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