1. National Animal Disease Center, National Veterinary Service Laboratories and Center for Veterinary Biologics, National Centers for Animal Health, United States Department of Agriculture, Ames, Iowa
2. Center for Epidemiology and Animal Health
3. Wildlife Research Center, Animal and Plant Health Inspection Service, United States Department of Agriculture, Fort Collins, Colorado
4. Infectious Bacterial Disease of Livestock Research Unit, National Animal Disease Center, National Centers for Animal Health, Agricultural Research Service, United States Department, Ames, Iowa