Do nothing
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There are no regulations requiring US dairy operations to do anything about controlling BLV disease.
Monitor BLV prevalence with serology testing of blood or saliva
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Saliva is not an appropriate body fluid to test because it generally lacks lymphocytes. Milk is a reliable fluid to test and is readily available.
Treat the herd with antiviral agents
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There is no antiviral therapy effective against this virus.
Test and cull BLV-positive cattle
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Create a disease-free herd, then maintain it by only allowing tested BLV-negative cattle in after a quarantine period and retesting.
Segregate BLV test-positive cattle until they test negative.
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The nature of retroviral infections is that they are persistent and the immune system cannot eliminate them.