1. U.S. Department of Agriculture, Animal and Plant Health Inspection Service, Wildlife Services, Fort Collins, Colorado.
2. U.S. Department of Agriculture, Animal and Plant Health Inspection Service, Wildlife Services, Honolulu, Hawaii.
3. U.S. Department of Agriculture, Animal and Plant Health Inspection Service, Wildlife Services, National Wildlife Research Center, Fort Collins, Colorado.
4. Department of Microbiology and Immunology, Institute for Human Infections and Immunity, University of Texas Medical Branch, Galveston, Texas.
5. U.S. Department of Agriculture, Animal and Plant Health Inspection Service, Wildlife Services, Okemos, Michigan.
6. U.S. Department of Agriculture, Animal and Plant Health Inspection Service, Wildlife Services, Palmer, Alaska.