If a dam has previously had a negative calf and then has a positive calf does she need to be tested? Yes. Unless the dam has already been directly tested. Related articles If a calf is positive for BVD virus is the dam also a PI? How do I find out my test results? If a dairy cow is a PI what do I do with her milk? What should I do if I have a PI? Comments 0 comments Please sign in to leave a comment.