1. Department of Microbiology, Bioinformatics Program, National Emerging Infectious Diseases Laboratories, Boston University, Boston, MA 02118, USA.
2. Molecular and Translational Sciences Division, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, MD 21702, USA.
3. Diagnostic Systems Division, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, MD 21702, USA.
4. Center for Genome Sciences, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, MD 21702, USA.
5. Virology Division, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, MD 21702, USA.