1. Rose Lake Wildlife Disease Laboratory, Michigan Department of Natural Resources, 8562 E. Stoll Rd., East Lansing, Michigan 48823, USA
2. Animal Health Diagnostic Laboratory and Department of Pathology, College of Veterinary Medicine, Michigan State University, East Lansing, Michigan 48824, USA
3. Community Health Laboratory, Michigan Department of Community Health, 3350 N. Martin Luther King, Jr., Blvd., Lansing, Michigan 48909