If the calf returns a positive BVD virus test result, it is strongly recommended to test the dam as she may also be a PI.
If a cow is PI then all of its offspring will be born persistently infected with BVD virus. If testing shows the dam to be PI then all offspring and descendants of that animal are considered to be PI and may not be sold (except directly to slaughter or through a slaughter-only market) without a negative test result.
