1. Division of Infectious Diseases, Department of Medicine, Duke University Medical Center, Durham, North Carolina.
2. Centers for Disease Control and Prevention, Bacterial Special Pathogens Branch, Atlanta, Georgia.
3. Kilimanjaro Christian Medical Centre, Moshi, United Republic of Tanzania.
4. Kilimanjaro Christian Medical College, Tumaini University, Moshi, Tanzania.
5. Duke Global Health Institute, Duke University, Durham, North Carolina.