1. Special Pathogens Program, National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Manitoba R3E 3R2, Canada.
2. Department of Medical Microbiology, University of Manitoba, Winnipeg, Manitoba R3E 0J9, Canada.
3. Department of Anatomy and Radiology, Department of Infectious Diseases, University of Georgia, Athens, GA 30602, USA.
4. Blood and Marrow Transplant Program, Department of Immunology, University of Michigan, Ann Arbor, MI 48109, USA.
5. Division of Global Epidemiology, Research Center for Zoonosis Control, Hokkaido University, Sapporo 001-0020, Japan.
6. Laboratory of Virology, Division of Intramural Research, National Institute of Allergy and Infectious Disease, National Institutes of Health, Rocky Mountain Laboratories, Hamilton, MT 59840, USA.
7. Department of Immunology, University of Manitoba, Winnipeg, Manitoba R3E 0T5, Canada.