1. Center for Drug Evaluation and Research, Food and Drug Administration, Silver Spring, MD 20903, USA
2. University of California, Irvine, CA 92697, USA
3. Unité des Virus Emergents, Marseille CEDEX 05, France
4. Georgetown University, Washington, DC, USA
5. Bernhard Nocht Institute for Tropical Medicine, 20359 Hamburg, Germany
6. University of Zurich, Zurich, Switzerland
7. University of Helsinki, 00014 Helsinki, Finland
8. Integrated Research Facility at Fort Detrick, Fort Detrick, Frederick, MD 21702, USA
9. University of Louisville, Louisville, KY 40202, USA
10. Universidad Nacional de La Plata—Consejo Nacional de Investigaciones Científicas y Técnicas, 49 y 115 s/n La Plata, Argentina
11. University of Maryland, College Park, MD 20742, USA
12. Scientific Institute IRCCS “E. Medea”, 23842 Bosisio Parini, Italy
13. Colorado State University, Fort Collins, CO 80523, USA
14. The Scripps Research Institute, La Jolla, CA 92037, USA