Bovine viral diarrhea virus (BVDV) is an economically important pathogen of cattle that is maintained in the population by persistently infected animals. Virus infection may result in reproductive failure, respiratory disease and diarrhoea in naïve, susceptible bovines. Here, the construction and characterization of a novel vectored vaccine, which is based on the incorporation of genes encoding BVDV structural proteins (C, Erns, E1, E2) into a bacterial artificial chromosome of the equine herpesvirus type 1 (EHV-1) vaccine strain RacH, are reported. The reconstituted vectored virus, rH_BVDV, expressed BVDV structural proteins efficiently and was indistinguishable from parental vector virus with respect to growth properties in cultured cells. Intramuscular immunization of seronegative cattle with rH_BVDV resulted in induction of BVDV-specific serum neutralizing and ELISA antibodies. Upon experimental challenge infection of immunized calves with the heterologous BVDV strain Ib SE5508, a strong anamnestic boost of the neutralizing-antibody response was observed in all vaccinated animals. Immunized animals presented with reduced viraemia levels and decreased nasal virus shedding, and maintained higher leukocyte counts than mock-vaccinated controls.
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