SUSCEPTIBILITY OF CATTLE TO AN ISOLATE OF Dictyocaulus viviparus FROM BLACK-TAILED DEER

¹ Department of Pathology, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada

Patent infections did not develop in calves after inoculation with Dictyocaulus viviparus infective larvae isolated from black-tailed deer (Odocoileus hemionus columbianus). One calf died of bacterial pneumonia on postinoculation day 21. Two calves coughed and had elevated respiratory rates and dyspnea between days 14 and 21. Respiration was normal for these calves on day 25.

A calf and a susceptible black-tailed deer were placed on contaminated grass pasture with eight deer infected naturally with D. viviparus. Patent infection did not develop in the calf but larvae of D. viviparus were recovered in feces from the deer on post-exposure day 30.