1. Department of Medical Microbiology, University of Manitoba, Winnipeg, Manitoba, Canada.
2. National Laboratory for HIV Immunology, Public Health Agency of Canada, Winnipeg, Manitoba, Canada.
3. Department of Medical Microbiology, University of Nairobi, Nairobi, Kenya.
4. Clinical Sciences Division, University of Toronto, Toronto, Ontario, Canada.
5. National Microbiology Laboratories, PHAC, Winnipeg, Manitoba, Canada.