Visna

**Definition:** Demyelinating leukoencephalomyelitis of sheep caused by the VISNA-MAEDI VIRUS. It is similar to but not the same as SCRAPIE.

**Tree numbers:** - C01.925.782.815.616.900 - C01.925.839.900 - C22.836.900

**Synonyms:** - Encephalomyelitis, Ovine - Ovine Encephalomyelitis