1. JC Wilt Infectious Diseases Research Center, National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Canada.
2. Department of Medical Microbiology & Infectious Diseases, University of Manitoba, Winnipeg, Canada.
3. Center for the AIDS Program of Research in South Africa (CAPRISA), Durban, South Africa.
4. Department of Medical Microbiology, University of Nairobi, Nairobi, Kenya.