1. Department of Biomedical Sciences, College of Veterinary Medicine, Oregon State University, 105 Magruder Hall, Corvallis, Oregon 97331, USA
2. US Department of Agriculture—Animal and Plant Health Inspection Service, Veterinary Services, National Veterinary Services Laboratories, 1800 Dayton Road, Ames, Iowa 50010, USA
3. US Department of Agriculture—Animal and Plant Health Inspection Service, Veterinary Services, 530 Center St. NE #335, Salem, Oregon 97301, USA
4. Oregon Department of Fish and Wildlife, 2040 SE Marine Science Drive, Newport, Oregon 97365, USA