Antibody to bovine viral diarrhea (BVD) virus was found in 174 of 1,905 (9.1%) exotic ruminants. Of the seropositive animals, 129 had titers of at least 1:8. When serums from zoos that had vaccinated against BVD were excluded from analysis, 60 of 1,390 samples (4.3%) were seropositive for BVD. Noncytopathogenic strains of BVD virus were isolated from 5 exotic ruminants.
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Doyle et al. (1983) studied this question.