| border disease in a flock of minnesota sheep. | a flock problem affecting newborn lambs on a minnesota farm was investigated. the lambs had hairy fleece and rhythmic tremors, and were unthrifty. histologic examination revealed hypomyelinization of the cns and hypertrophy of primary follicles in the skin. a virus antigenically related to bovine viral diarrhea virus was isolated. serum neutralization showed that a large number of flock ewes had much higher titers to bovine viral diarrhea virus than did control animals. | 1982 | 6279553 |