Abstract
Two different strains (Teshio and Erimo) of infectious bovine rhinotracheitis (IBR) virus were intranasally inoculated into calves and produced a slight rhinitis. Changes were consistently observed in the trigeminal ganglion. The severity of the lesions was more extensive in the calves exposed to the Erimo strain and the lesions were accompanied by degeneration of the ganglion cells and neuronophagia. Trigeminal ganglionitis produced by the two strains of virus may be a useful feature for the histopathological diagnosis of IBR virus infection in calves.
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