The clinical, gross, and microscopic findings of an outbreak of bluetongue (BT) in a herd of captive white-tailed deer are described. Serologic diagnosis of BT was accomplished by fluorescent antibody (FA) reaction in tissues from affected deer. The basic lesion was considered on the basis of histopathologic and FA findings to be a vasculitis. A possible relationship of BTV of deer and sheep to epizootic hemorrhagic disease of deer is discussed.
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