1. Department of Microbiology and Immunology, Muhimbili University of Health and Allied Sciences (MUHAS), Dar es Salaam, Tanzania.
2. Department of Clinical Science, University of Bergen, Bergen, Norway.
3. Department of Medicine, Haukeland University Hospital, Bergen, Norway.
4. Department of Paediatrics and Child Health, Muhimbili National Hospital (MNH), Dar es Salaam, Tanzania.
5. Central Pathology Laboratory, Department of Laboratory Services, MNH, Dar es Salaam, Tanzania.
6. Department of Paediatrics and Child Health, MUHAS, Dar es Salaam, Tanzania.