1. Division of Viral Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA, USA
2. Oak Ridge Institute for Science and Education, Oak Ridge, TN, USA
3. Epidemic Intelligence Service, Centers for Disease Control and Prevention, Atlanta, GA, USA
4. Division of Foodborne, Waterborne, and Environmental Diseases, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, GA, USA
5. Atlanta Research and Education Foundation, Atlanta, GA, USA
6. IHRC, Inc., Atlanta, GA, USA
7. CDC Foundation, Atlanta, GA, USA