| visna | 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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| Visna maedi virus | <virology> A retrovirus of sheep and goats. A member of the lentivirus subfamily related to HIV. First identified in Iceland when it was introduced by sheep imported from Germany and causes two diseases the most common, maedi, is a pulmonary infection (maedi is Icelandic for shortness of breath) and when it infects the nervous system, visna, a paralysis similar to multiple sclerosis (visna is Icelandic for wasting). (18 Nov 1997) |
| visna virus | <virology> A virus in the subfamily Lentivirinae which causes encephalitis andchronic pneumonitis in sheep. (09 Oct 1997) |
| visna-maedi virus | A species of lentivirus, subgenus ovine-caprine lentiviruses (lentiviruses, ovine-caprine), that can cause chronic pneumonia (maedi), mastitis, arthritis, and encephalomyelitis (visna) in sheep. Maedi is a progressive pneumonia of sheep which is similar to but not the same as jaagsiekte (pulmonary adenomatosis, ovine). Visna is a demyelinating leukoencephalomyelitis of sheep which is similar to but not the same as scrapie. (12 Dec 1998) |