Even if an operation is seemingly BVD free, there are many ways a herd can be exposed.
“Animals can be exposed to BVD through being exposed to animals that are acutely infected or to animals that are persistently infected with BVD,” Givens says.
Givens also reminds producers that a persistently infected cow will always give birth to a persistently infected calf. However, just because you have a persistently infected calf does not mean its dam was persistently infected; she may have just been exposed to BVD during gestation, so testing is key to understanding your BVD baseline.
Having a control plan in place can help prevent a BVD outbreak before it becomes a significant problem. Talk with your local veterinarian about developing a comprehensive BVD control plan to continue to protect your herd.