Instituto de Ganadería de Montaña (CSIC-ULE), 24346 Grulleros, León, Spain.
Vet J. 2013 Sep;197(3):607-12. doi: 10.1016/j.tvjl.2013.03.031. Epub 2013 May 3.
Maedi-visna (MV) is a slow lentiviral disease of sheep that has a significant economic impact in many sheep-producing regions although there remains a paucity of data relating to actual production losses resulting from this disease. The objective of this study was to evaluate direct losses, through death or culling, from two dairy sheep flocks with high seroprevalences of infection over a 2 year period. Maedi-visna was found, either alone or in combination with other diseases, to be the most common disease diagnosed in these sheep, and the major cause of direct animal losses in the two flocks. Moderate to severe lesions associated with MV were found in 52% and 80% of the sheep, respectively, affecting the lungs, brain and/or mammary glands. Despite the similarity of the two flocks under study in terms of breed, number of animals, geographical proximity, and inter-change of rams, a striking difference was observed regarding the clinical presentation of the disease: in one flock the respiratory form was dominant while in the other 70% of animals died or were culled because of neurological signs.
绵羊梅迪-维斯纳病（MV）是一种缓慢的慢病毒病，尽管与该病导致的实际生产损失相关的数据仍然很少，但它对许多绵羊生产地区都有重大的经济影响。本研究的目的是评估两个奶牛绵羊群在 2 年期间因高血清感染率而导致的直接死亡或淘汰损失。梅迪-维斯纳病单独或与其他疾病一起被发现是这些绵羊中最常见的疾病，也是这两个羊群中直接动物损失的主要原因。在这两个羊群中，分别有 52%和 80%的绵羊发现了与 MV 相关的中度至重度病变，病变影响肺部、大脑和/或乳腺。尽管研究中的两个羊群在品种、动物数量、地理位置和公羊交换方面相似，但疾病的临床表现却存在显著差异：在一个羊群中，呼吸道形式占主导地位，而在另一个羊群中，70%的动物因神经症状而死亡或被淘汰。
