1. Department of Microbiology, Stellenbosch University, Matieland 7602, South Africa
2. Department of Biotechnology, Institute for Microbial Biotechnology and Metagenomics (IMBM), University of the Western Cape, Bellville 7535 South Africa
3. Division of Clinical Pharmacology, Department of Medicine, Faculty of Medicine and Health Sciences, Stellenbosch University, Parow 7505, South Africa