Abstract
West African dwarf sheep were inoculated by the subcutaneous route with epizootic haemorrhagic disease of deer (EHD) virus or bluetongue (BT) virus. No clinical disease was observed following primary EHD or BT infection, or subsequent challenge with either homologous or heterologous virus. However, viraemia was detected in non-immune sheep exposed to BT virus, but not in BT- or EHD-immune sheep challenged with either virus, or in non-immune sheep exposed to primary EHD virus infection. Complement fixing antibodies developed against both EHD and BT viruses following the primary infection with either virus, or subsequent challenge with homologous or heterologous virus. Following a primary infection, virus-neutralising (VN) antibodies developed only against the inoculated virus, while the detection of VN antibodied to both viruses followed the challenge of an EHD- or BT-immuned sheep with either the homologous or heterologous virus. These findings further support previous reports of a relationship between EHD and BT viruses. between EHD and BT viruses.
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