1. Department of Microbiology, Boston University School of Medicine, Boston, MA 02118, USA.
2. National Emerging Infectious Diseases Laboratories Institute, Boston University School of Medicine, Boston, MA 02118, USA.
3. Laboratory of Virology, National Institutes of Health, Rocky Mountain Laboratories, Hamilton, MT 59840, USA.
4. Sealy Center for Vaccine Development, Departments of Pathology and Microbiology and Immunology, University of Texas Medical Branch, Galveston, TX 77555–0610, USA.
5. Offices of Operations and Management, National Institutes of Health, Rocky Mountain Laboratories, Hamilton, MT 59840, USA.
6. Rocky Mountain Veterinary Branch, Division of Intramural Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rocky Mountain Laboratories, Hamilton, MT 59840, USA.
7. Department of Microbiology and Immunology, University of Texas Medical Branch, Galveston, TX 77550, USA.
8. Galveston National Laboratory, University of Texas Medical Branch, Galveston, TX 77550, USA.
9. Department of Microbiology and Immunology, Uniformed Services University, Bethesda, MD 20814, USA.
10. Department of Medical Microbiology, University of Manitoba, Winnipeg, Manitoba, MB R3T 2N2, Canada.