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In the UK from 1978-1999 until. Pedigree Holsteins were imported from Canada but MAFF ran a test and removal scheme (agar-gel immunodiffusion for serum antibody on their descendants).
The disease is transferred by blood ie by vets doing rectals, disbudding, or biting insects.
MAFF also did histology on bovine tumours, which were always metastases of other tumours.
 
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