1. Diagnostic Center for Population and Animal Health, Michigan State University, East Lansing, Michigan 48824, USA
2. Department of Pathobiology and Diagnostic Investigation, College of Veterinary Medicine, East Lansing, Michigan 48824, USA
3. Rose Lake Wildlife Disease Laboratory, Wildlife Division, Michigan Department of Natural Resources, East Lansing, Michigan 48823-9454, USA
4. Southeast Michigan Wildlife Rehabilitation, Gross Ile, Michigan 48138, USA