1. Columbia University, New York, New York, USA;
2. University of Pretoria and National Health Laboratory Services, Pretoria, South Africa;
3. Public Health Agency of Canada, Winnipeg, Manitoba, Canada;
4. United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland, USA;
5. Bernhard-Nocht-Institute of Tropical Medicine, Hamburg, Germany;
6. Centers for Disease Control and Prevention, Atlanta, Georgia, USA;
7. National Institute for Communicable Diseases, Sandringham, South Africa;
8. Public Health Agency of Canada, Winnipeg, Manitoba, Canada;University of Manitoba, Winnipeg, Manitoba, Canada;
9. National Institutes of Allergy and Infectious Diseases Integrated Research Facility, Fort Detrick, Frederick, Maryland, USA