1. HIV Pathogenesis Programme, Doris Duke Medical Research Institute, University of KwaZulu-Natal, Durban, South Africa.
2. Department of Paediatrics and Child Health, University of KwaZulu-Natal, Durban, South Africa.
3. Department of Virology, University of KwaZulu-Natal, Durban, South Africa.
4. Monogram Biosciences, Inc., South San Francisco, California.
5. Centre for the AIDS Programme of Research in South Africa (CAPRISA), University of KwaZulu-Natal, Durban, South Africa.