Test upgrade offers chance to identify Persistently Infected animals

Bovine Viral Diarrhoea (BVD) is a notoriously difficult disease to control.  While eradication is regularly discussed in the media, this is not a viable route for most UK producers due to cattle population densities and the problems of maintaining good bio-security.  Testing a herd's BVD status, with bulk milk (dairy) or blood sampling (beef) has been used for some time, and indicates whether a herd is suffering from active infection, has been exposed to the virus, or is naive.  A vaccination strategy can then be developed.

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