Affiliation: | Livestock Veterinary Service, PO Box 353, 917 South Aurora Street, Eldon, MO 65026, USA;Pathobiology and Population Medicine, Department of Pathobiology and Population Medicine, College of Veterinary Medicine , Mississippi State UniversityMississippi State, MS 39762, USA;Boehringer Ingelheim, Animal Health USA, Inc, Collinsville, OK 74021, USA |