1. Center for Biological Threats and Special Pathogens, Robert Koch Institute, Berlin, Germany
2. Viral Special Pathogens Branch, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
3. Diagnostic Systems Division, U.S. Army Medical Research Institute of Infectious Diseases, Fort Detrick, Maryland, USA
4. Center for Genome Sciences, U.S. Army Medical Research Institute of Infectious Diseases, Fort Detrick, Maryland, USA
5. Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, Nebraska, USA