Margaret Khonga1, Mark Patrick Nicol2. 1. Division of Medical Microbiology, Department of Pathology, Cape Town 7925, South Africa; University of Cape Town, Cape Town 7925, South Africa; National Health Laboratory Service, Cape Town, South Africa. 2. Division of Medical Microbiology, Department of Pathology, Cape Town 7925, South Africa; Institute of Infectious Diseases and Molecular Medicine, Cape Town 7925, South Africa; University of Cape Town, Cape Town 7925, South Africa; National Health Laboratory Service, Cape Town, South Africa. Electronic address: mark.nicol@uct.ac.za.