1. Department of Chemical Engineering, Minerals to Metals Initiative, University of Cape Town, Cape Town 7701, South Africa
2. Department of Chemical Engineering, Centre for Minerals Research, University of Cape Town, Cape Town 7701, South Africa
3. Department of Environmental and Geographical Science, University of Cape Town, Cape Town 7701, South Africa
4. Welcome Centre for Infectious Diseases Research in Africa, Institute for Infectious Diseases and Molecular Medicine, Division of Immunology, Department of Pathology, University of Cape Town, Cape Town 7935, South Africa
5. Neuroscience Institute, University of Cape Town, Cape Town 7935, South Africa
6. National Health Laboratory Service, Johannesburg 2193, South Africa