Enzootic bovine leukosis
Ver/Abrir
Autor/a
Berg, Charlotte
Bøtner, Anette
Browman, Howard
De Koeijer, Aline
Depner, Klaus
Ducrot, Christian
Edwards, Sandra
Fourichon, Christine
Koenen, Frank
More, Simon
Raj, Mohan
Sihvonen, Liisa
Spoolder, Hans
Stegeman, Jan Arend
Thulke, Hans-Hermann
Vågsholm, Ivar
Willeberg, Preben
Fecha de publicación
2015-07-10ISSN
1831-4732
Resumen
Enzootic bovine leukosis is a disease of cattle caused by bovine leukemia virus (BLV). The virus causes a persistent, life-long infection in a subset of B cells. Malignant tumours (lymphomas) ultimately develop in 2–5% of infected animals, predominantly in adult cattle older than 3–5 years. Lymphomas invariably lead to death of the animal within months. Before 1960, BLV was endemic in dairy herds in Northern/Eastern Europe and North America. Since then it has spread to all continents. The disease has been successfully controlled and eliminated from many countries in Europe. There is no evidence to suggest that any significant reservoir of BLV exists among other species, nor for any role of BLV in
human disease or cancers. BLV exhibits a slow, progressive spread within a herd and it is likely to persist if control measures are not applied. The main modes of transmission are perinatal from cow to calf, via colostrum and milk, and close contact that allows transfer of infected lymphocytes, such as dehorning and injections using non-sterile utensils. Transfer between herds is almost entirely by movement of infected animals. Suitable methods have been developed for diagnosis of BLV infection in specimens of blood, milk and lymphomas. EBL has a negative impact on milk yield and leads to increased premature culling. The welfare consequences of lymphomas vary according to the location and magnitude of organ
involvement. Criteria for maintaining country freedom from EBL differ substantially between OIE and EU. Surveillance for freedom should be based on a combination of serological testing of adult animals and identification of lymphomas at slaughter.
Tipo de documento
Artículo
Versión del documento
Versión publicada
Lengua
English
Materias (CDU)
636 - Explotación y cría de animales. Cría del ganado y de animales domésticos
Páginas
63
Publicado por
Wiley
Publicado en
EFSA Journal
Citación
Berg, Charlotte, Anette Bøtner, Howard Browman, Aline De Koeijer, Klaus Depner, Mariano Domingo, and Christian Ducrot et al. 2015. “Scientific opinion on enzootic bovine leukosis”. EFSA Journal 13(7): 4188. doi:10.2903/j.efsa.2015.4188.
Program
Benestar Animal
Sanitat Animal
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