1. HIV Prevention Research Unit
2. Biostatistics Unit, South African Medical Research Council, Durban
3. School of Laboratory Medicine and Medical Sciences, University of KwaZulu-Natal, Durban, Medical Microbiology Department, National Health Laboratory Services, Durban, Centre for the AIDS Programme of Research in South Africa, Durban
4. Medical Microbiology Department, National Health Laboratory Services, Durban
5. HIV Prevention Research Unit, Department of Paediatrics and Child Health, University of KwaZulu-Natal, Durban
6. Department of Paediatrics and Child Health, University of KwaZulu-Natal, Durban
7. eThekwini Health Unit, eThekwini Municipality, Durban, South Africa
8. Centre for the AIDS Programme of Research in South Africa, Durban
9. School of Laboratory Medicine and Medical Sciences, University of KwaZulu-Natal, Durban, Medical Microbiology Department, National Health Laboratory Services, Durban