| prevalence of antibodies to seven viruses in a flock of ewes in minnesota. | blood samples were collected from a flock of healthy ewes at a university of minnesota research station. sera from these blood samples were tested for antibodies against 7 viruses, using 3 tests (eg, virus-neutralization test for bovine viral diarrhea virus, infectious bovine rhinotracheitis virus, bovine adenovirus type 3, and bovine respiratory syncytial virus; hemagglutination inhibition test for parainfluenza virus type 3; and agar-gel immunodiffusion test for lentivirus of ovine progressive ... | 1988 | 2837112 |