aDivision of Infectious Diseases and International Health, Department of Medicine, Duke University Medical Center, USA
bDuke Global Health Institute, Duke University, Durham, North Carolina, USA
cKilimanjaro Christian Medical Centre, Tanzania
dKilimanjaro Christian Medical College, Tumaini University, Moshi, Tanzania
eDepartment of Molecular Medicine and Haematology, School of Pathology, Faculty of Health Sciences, University of Witwatersrand, South Africa
fNational Health Laboratory Service, Parktown, South Africa.
Received 1 December, 2009
Accepted 6 December, 2009