Cleveland, Susan M., Matthew A. Cleveland, Mo D. Salman, Robert G. Mortimer, and Hana Van Campen. 2004. “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”. The Bovine Practitioner 38 (2):155-60. https://doi.org/10.21423/bovine-vol38no2p155-160.