Although initial FA (1:30 dilution of porcine anti-BVDV polyclonal antisera, American BioResearch Laboratories, TN)) was only weak positive for BVDV, immunohistochemistry (1:20 dilution of 15.c.5 anti BVDV EO Mab cell culture supernatant supplied by Dr. Amy Glase) detected BVD antigen in virtually every tissue examined including epithelium of the entire GI tract with muscle, intestinal smooth musc