1. Epidemic Intelligence Service, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
2. Wisconsin Department of Health Services, Division of Public Health, Bureau of Environmental and Occupational Health, Madison, Wisconsin, USA
3. Poxvirus and Rabies Branch, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
4. Department of Pathobiological Sciences and Global Health Institute, University of Wisconsin-Madison, Madison, Wisconsin, USA
5. Department of Biosecurity, Ecosystems and Veterinary Public Health, Makerere University, Kampala, Uganda
6. Department of Veterinary Biomedical Sciences, College of Veterinary Medicine, University of Minnesota, St. Paul, Minnesota, USA
7. Department of Environmental Sciences and Program in Population Biology, Ecology and Evolution, Emory University, Atlanta, Georgia, USA
8. Department of Anthropology, McGill University, Montreal, Quebec, Canada