1. US Department of Agriculture, Animal and Plant Health Inspection Service, Wildlife Services, 4101 LaPorte Avenue, Fort Collins, Colorado 80521, USA;
2. US Department of Agriculture, Animal and Plant Health Inspection Service, Wildlife Services, 2803 Jolly Road, Suite 100, Okemos, Michigan 48864, USA;
3. US Department of Agriculture, Agricultural Research Service, Southeast Poultry Research Laboratory, 934 College Station Road, Athens, Georgia 30605, USA;
4. Animal and Plant Health Inspection Service, Wildlife Services, US Department of Agriculture, 9134 Blackeagle Drive, Boise, Idaho 83709, USA;
5. US Department of Agriculture, Animal and Plant Health Inspection Service, Wildlife Services, National Wildlife Research Center, 4101 LaPorte Avenue, Fort Collins, Colorado 80521, USA;