1. Department of Microbiology, Oregon State University, 220 Nash Hall, Corvallis, Oregon 97331, USA
2. North Reading Veterinary Clinic, 212 Main Street, North Reading, Massachusetts 01864, USA
3. Oregon Department of Fish and Wildlife, 7118 Vandenberg Avenue, Corvallis, Oregon 97331, USA
4. Oregon Department of Fish and Wildlife, 4192 N Umpqua Highway, Roseburg, Oregon 97470, USA
5. College of Veterinary Medicine, Oregon State University, 146 Magruder Hall, Corvallis, Oregon 97331, USA