1. Department of Medicine, University of Washington, Seattle, Washington.
2. Department of Medical Microbiology, University of Manitoba, Winnipeg, Manitoba, Canada.
3. Department of Community Health Sciences, University of Manitoba, Winnipeg, Manitoba, Canada.
4. Department of Medical Microbiology, University of Nairobi, Nairobi, Kenya.
5. Fred Hutchinson Cancer Research Center, Vaccine and Infectious Diseases Division and Public Health Science Division, Seattle, Washington.
6. Kenya Medical Research Institute, Nairobi, Kenya.
7. Department of Epidemiology, University of Washington, Seattle, Washington.
8. Department of Global Health, University of Washington, Seattle, Washington.