Recovery of reovirus type 2 from an immature dog with respiratory tract disease.

Two similar cytopathic agents were recovered from the throat and rectal swab specimens of an immature dog with upper respiratory tract disease. The reference isolate, 14-72R, was shown to be a member of the reovirus group by its physicochemical properties, cytopathic effects in cell cultures, and appearance when examined in the electron microscope. Both isolates hemagglutinated human type O erythrocytes and antigenically were closely related to reovirus type 2. The affected pup had an increase in antibody titer to reovirus types 2 and 3. The latter findings provide evidence for possible heterotypic antibody responses in dogs to reovirus infection.