1. Department of Medicine, Khayelitsha District Hospital, Cape Town, South Africa
2. Obstetric Infectious Diseases Clinic, Groote Schuur Hospital, Cape Town, South Africa
3. PMTCT Programme, Provincial Department of Health, Khayelitsha and Eastern Substructure, W Cape, South Africa
4. Médicins Sans Frontières, Cape Town, South Africa
5. Centre for Infectious Disease Epidemiology and Research, School of Public Health and Family Medicine, University of Cape Town, South Africa