Nagele M J
Vet Rec. 1984 Nov 10;115(19):496-9. doi: 10.1136/vr.115.19.496.
An outbreak of mucosal disease that occurred among Friesian heifers aged 15 to 18 months is described as it occurred. Investigation suggested that many heifers were immunotolerant to bovine virus diarrhoea-mucosal disease virus. Serious losses were incurred. The present policy of surveillance is described.