1. The Wilds Conservation Center, 14000 International Road, Cumberland, Ohio 43732, USA;
2. Animal Parasitic Diseases Laboratory, Building 1001, Beltsville Agricultural Research Center, Agricultural Research Service, US Department of Agriculture, Beltsville, Maryland 20705, USA;
3. Department of Clinical Sciences, Auburn University College of Veterinary Medicine, 1220 Wire Road, Auburn, Alabama 36849, USA;