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1 Bali Cattle Disease Investigation Unit, P.O. Box 416, Denpasar, Bali, Indonesia
2 School of Veterinary Studies, Murdoch University, Murdoch WA 6150
and3 Department of Microbiology, University of Western Australia, Nedlands WA 6009, Australia
and4 Institute for Animal Health, Compton, Nr. Newbury, Berkshire RG16 0NN, U.K.
A virus causing Jembrana disease in Bali cattle (Bos javanicus) was demonstrated to have characteristics of a retrovirus. Reverse transcriptase activity was detected in virus purified by sucrose gradient centrifugation. Electron microscopic examination of tissue from the affected cattle indicated that the virus matured by C-type budding through the plasma membrane and into intracytoplasmic vacuoles of cells in lymphoid tissue, with the formation of circular enveloped virus particles ranging in diameter from 96 to 124 nm with an eccentric nucleoid. Western immunoblotting using sera from recovered animals demonstrated virus proteins of Mr 100K, 45K, 42K, 33K, 26K, 16K and 14K. The 26K protein of Jembrana disease virus cross-reacted in Western blots with the 26K capsid protein of bovine immunodeficiency virus (BIV). The apparent morphogenesis, protein structure and antigenic relationship with BIV suggested the virus was a lentivirus.
Received 24 August 1992;
accepted 19 April 1993.
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