Abstract

Infection of adult mice with small doses of neuro-virulent bovine ephemeral fever virus caused a rapidly fatal encephalitis, the course of which was largely unaffected by treatment with either cyclophosphamide or anti-lymphocyte serum. Athymic mice died earlier than their thymic littermates. Mice could be protected by treatment with defective virus before infection or by passive administration of antibody if given less than 48 h after infection. Taken together these results emphasize the important protective role of antibody present at the time of infection. Viral isolation and immuno-fluorescent studies showed that the virus is confined to the central nervous system. Regular infection of suckling and adult mice by extra-cerebral routes was not possible.

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