1. Special Pathogens Program, National Microbiology Laboratory, Health Canada, Canadian Science Centre for Human and Animal Health, Winnipeg, Canada R3E 3R2
2. Department of Medical Microbiology, University of Manitoba, Winnipeg, Canada R3E 0W3
3. Center for Microbiological Preparedness, Swedish Institute for Infectious Disease Control, SE-171 82 Solna
4. Swedish Defence Research Agency, SE-901 82 Umeå
5. Department of Medical Biosciences/Pathology, Umeå University, SE-901 85 Umeå, Sweden