If BVD is not present in your herd, look at your Biosecurity measures and consider the 3B’s (Buying, Borrowing and Boundaries) in preventing BVD introduction.
If BVD is found, screen by tag & test and remove all PI’s as soon as they are found. Eliminate them by culling immediately. After your final PI discovery, tag & test all calves for one year after. Any more PI’s that are subsequently found, then tag & test all newborn calves for 1 year thereafter.