1. Program in Population Biology, Ecology, and Evolution, Emory University, Atlanta, Georgia 30322, USA
2. Poxvirus Program, Poxvirus and Rabies Branch, Division of High-Consequence Pathogens and Pathology, Centers for Disease Control and Prevention, 1600 Clifton Road MS-G6, Atlanta, Georgia 30333, USA
3. Department of Environmental Studies, Emory University, 400 Dowman Drive, Atlanta, Georgia 30322, USA
4. Department of Biology, College of Natural Sciences, Makerere University, P.O. Box 7062, Kampala, Uganda
5. College of Veterinary Medicine, University of Wisconsin, 2015 Linden Drive, Madison, Wisconsin 53706, USA
6. Department of Microbiology, College of Medicine, University of Illinois at Urbana-Champaign, 601 South Goodwin Avenue, Urbana, Illinois 61801, USA
7. Department of Environmental Health, Rollins School of Public Health, Emory University, Claudia Nance Rollins Building, 1518 Clifton Road NE, Atlanta, Georgia 30322, USA