1. Department of Microbiology and Immunology, School of Medicine, Muhimbili University of Health and Allied Sciences, Dar es Salaam P.O. Box 65001, Tanzania
2. Medipeace Global Health, Dar es Salaam P.O. Box 77978, Tanzania
3. Mwananyamala Regional Referral Hospital, Dar es Salaam P.O. Box 61665, Tanzania