1. Veterinary Services, Animal and Plant Health Inspection Service, United States Department of Agriculture, Holt, Michigan 48842, USA
2. Wildlife Disease Laboratory, Rose Lake Wildlife Research Station, Michigan Department of Natural Resources, East Lansing, Michigan 48823, USA
3. Animal Health Diagnostic Laboratory and Department of Pathology, College of Veterinary Medicine, Michigan State University, East Lansing, Michigan 48824, USA
4. National Veterinary Services Laboratories, United States Department of Agriculture, Ames, Iowa 50010, USA
5. Agricultural Research Service, United States Department of Agriculture, Ames, Iowa 50010, USA
6. Atlanta Field Office, Wildlife Division, Michigan Department of Natural Resources, Atlanta, Michigan 49709, USA