1. Center for Virus Research, Kenya Medical Research Institute, Nairobi, Kenya.
2. KEMRI/JICA Project, Nairobi, Kenya.
3. Institute of Tropical Medicine and Infectious Diseases, Jomo Kenyatta University of Agriculture and Technology, Juja, Kenya.
4. Department of Biochemistry, Jomo Kenyatta University of Agriculture and Technology, Juja, Kenya.
5. Global AIDS Programme Centers for Disease Control, Kenya.
6. Department of Microbiology, Univeristy of Manitoba, Winnipeg, Manitoba, Canada.