1. Division of Infectious Diseases Department of Medicine Duke University Medical Center 163 Hanes House Trent Drive Durham NC 27710 USA
2. Department of Molecular Genetics and Microbiology Duke University Medical Center RM 214 Jones Building Research Drive Durham NC 27710 USA
3. Perelman School of Medicine University of Pennsylvania 3400 Civic Center Blvd Philadelphia PA 19104 USA
4. Botswana–UPenn Partnership National Health Laboratory PO Box AC 157 ACH, Plot 5353 Extension 10 Church Road Gaborone Botswana