1 Special Pathogens, National Microbiology Laboratory, Public Health Agency of Canada.
2 Department of Medical Microbiology and Infectious Diseases, University of Manitoba, Winnipeg, Canada.
3 Department of Paediatrics and Child Health, College of Medicine, Faculty of Health Sciences, University of Manitoba, Winnipeg, Canada.
4 Laboratory of Virology, Division of Intramural Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Hamilton, Montana.