T-J John1, U Lalla1, J J Taljaard2, K G John1, J Slabbert3, C F N Koegelenberg1. 1. From the Division of Pulmonology, Department of Medicine, Stellenbosch University & Tygerberg Academic Hospital, PO Box 241, Cape Town, 8000. 2. Division of Infectious Diseases, Department of Medicine, Stellenbosch University & Tygerberg Academic Hospital, PO Box 241, Cape Town, 8000. 3. Division of Medical Microbiology, Department of Pathology, Stellenbosch University & Tygerberg Academic Hospital, PO Box 241, Cape Town, 8000, South Africa.