“Case Study: Removal of bovine viral diarrhea virus (BVDV) persistently infected (PI) animals from a United States beef herd: Effect on PI animal prevalence and BVDV seroprevalence. Case Study” (2004) The Bovine Practitioner, 38(2), pp. 155–160. doi:10.21423/bovine-vol38no2p155-160.