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Medical Definition of Visna
1. Demyelinating leukoencephalomyelitis of sheep caused by the visna-maedi virus. It is similiar to but not the same as scrapie. (12 Dec 1998)
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1. Demyelinating leukoencephalomyelitis of sheep caused by the visna-maedi virus. It is similiar to but not the same as scrapie. (12 Dec 1998)