1. Department of Production Animal Health, Faculty of Veterinary
Medicine, University of Calgary, Calgary, Alberta, Canada (Barkema, Bras, Windeyer)
2. Vaccine and Infectious Disease Organization, International Vaccine Centre (Suleman; Perez-Casal), University of Saskatchewan, Saskatoon, Saskatchewan, Canada
3. Department of Large Animal Clinical Sciences, Western College of Veterinary Medicine (Woodbury), University of Saskatchewan, Saskatoon, Saskatchewan, Canada
4. Ruminant Diseases and Immunology Research Unit, U.S. Department of Agriculture, Agricultural Research Service, National Animal Disease Center, Ames, IA (Register)