Inventors:
Chichi Huang - Berwyn PA, US
Michael G. Sheppard - Victoria, AU
Xuemei Cao - Scituate MA, US
Gabriele M. Zybarth - Westport MA, US
International Classification:
A61K 39/12, C12N 7/00, C12Q 1/70
Abstract:
The present invention is directed to a bovine viral diarrhea virus comprising at least one helicase domain amino acid mutation wherein the mutation in the NS3 domain results in a loss of recognition by a monoclonal antibody raised against wild-type NS3 but wherein viral RNA replication and the generation of infectious virus is retained. The present invention is useful, for example, to produce a marked bovine viral diarrhea virus vaccine or to differentiate between vaccinated and infected or unvaccinated animals.