1. Department of Integrative Biomedical Sciences, Faculty of Health Sciences, University of Cape Town, Cape Town 7925, South Africa
2. Department of Medicine, University of Cape Town and Groote Schuur Hospital, Cape Town 7925, South Africa
3. Wellcome Centre for Infectious Diseases Research in Africa, University of Cape Town, Cape Town 7925, South Africa
4. Division of Medical Virology, Department of Pathology, University of Cape Town, Cape Town 7925, South Africa
5. Institute of Infectious Disease and Molecular Medicine, Faculty of Health Sciences, University of Cape Town, Cape Town 7925, South Africa