Abstract
The authors reviewed scientific and regulatory documents on the prevention and control of bovine leukemia. Bovine leukemia is an infectious disease of tumor nature with a chronic course, the main sign of which is the malignant overgrowth of cells of the hematopoietic organs with disruption of their maturation. Such overgrowth eventually leads to diffuse infiltration of the organs by these cells or the development of a tumor. The disease is asymptomatic in 70 % of infected animals, causing persistent lymphocytosis and lymphosarcoma in 30 and 5 % of infected animals, respectively. Infections caused by retroviruses share some common features: long incubation period, latent or chronic course, strictly limited range of susceptible animals, and long persistence of the virus in the body. The virus persists in the body throughout the life of an animal.
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