1 Division of Medical Microbiology, Department of Pathology, University of Cape Town, Cape Town 7700, South Africa; National Health Laboratory Service, Johannesburg, South Africa.
2 Division of Medical Microbiology, Department of Pathology, University of Cape Town, Cape Town 7700, South Africa; Institute of Infectious Diseases and Molecular Medicine, University of Cape Town, Cape Town 7700, South Africa; National Health Laboratory Service, Johannesburg, South Africa. Electronic address: mark.nicol@uct.ac.za.