1. University of Vermont, Department of Biology, 109 Carrigan Drive, Burlington, Vermont 05401, USA
2. United States Department of Agriculture, Animal and Plant Health Inspection Service, Wildlife Services, National Rabies Management Program, 59 Chenell Drive, Suite 2, Concord, New Hampshire 03301, USA
3. United States Department of Agriculture, Animal and Plant Health Inspection Service, Wildlife Services, National Wildlife Research Center, 4101 Laporte Avenue, Fort Collins, Colorado 80521, USA
4. United States Department of Agriculture, Animal and Plant Health Inspection Service, Wildlife Services, 617 Comstock Road, Suite 9, Berlin, Vermont 05602, USA