1. Biopharming Research Unit, Department of Molecular and Cell Biology, Faculty of Science, University of Cape Town, Rondebosch 7701, Cape Town, South Africa
2. Division of Medical Virology, Department of Pathology, Faculty of Health Sciences, University of Cape Town, Observatory 7925, Cape Town, South Africa
3. Institute of Infectious Disease and Molecular Medicine, Faculty of Health Sciences, University of Cape Town, Observatory 7925, Cape Town, South Africa
4. National Health Laboratory Service, Groote Schuur Hospital, Observatory 7925, Cape Town, South Africa