Abstract
Bovine viral diarrhea virus (BVDV) antigen was detected in cell culture with an indirect immunoperoxidase (IP) procedure using a specific monoclonal antibody, and an avidin-biotin-peroxidase complex. Cytopathic and noncytopathic strains of the virus showed similar patterns of IP staining until 3 days post-infection. At six days post-infection, intensity of staining decreased in cell cultures infected with noncytopathic virus, but not with cytopathic virus. The IP procedure detected BVDV antigen in cells used to isolate virus from tissues of aborted bovine fetuses and peripheral blood lymphpcytes of adult cattle. Immunoperoxidase detected BVDV isolates from 10 of 44 cases of abortion of which seven of these were noncytopathic. Noncytopathic BVDV isolates from the peripheral blood lymphocytes of 7 of 65 animals were identified.
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