1. Cummings School of Veterinary Medicine, Tufts University, 200 Westboro Road, North Grafton, Massachusetts 01536, USA
2. Louisiana Department of Wildlife and Fisheries, Wildlife Division, 2000 Quail Drive, Baton Rouge, Louisiana 70808, USA
3. Southeastern Cooperative Wildlife Disease Study, 589 D. W. Brooks Drive, College of Veterinary Medicine, The University of Georgia, Athens, Georgia 30602, USA