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visna

   Also found in: Wikipedia 0.08 sec.
visna
a meningoencephalitis of sheep caused by a lentivirus identical with the virus of maedi—hence the commonly used name of maedi-visna. The disease is characterized by a long incubation period, up to 2 years, followed by a prolonged clinical disease in which there is a demyelinating encephalomyelitis resulting in incoordination, tremor and wasting for a period of up to 2 years.
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