1. Veterinary Wildlife Services, South African National Parks, PO Box 110040, Hadison Park, Kimberley 8306, South Africa
2. BirdLife South Africa, PO Box 515, Randburg 2125, South Africa
3. National Zoological Gardens of South Africa, PO Box 754, Pretoria 0001, South Africa
4. Electron Microscope Unit, Faculty of Veterinary Science, University of Pretoria, Private Bag X04, Onderstepoort 0110, South Africa
5. Institute of Infectious Disease and Molecular Medicine and Department of Clinical Laboratory Sciences, Faculty of Health Sciences, University of Cape Town, Cape Town 7925, South Africa
6. National Health Laboratory Service, Groote Schuur Hospital, Observatory, Cape Town 7925, South Africa
7. Genetics Department, University of the Free State, P.O. Box 339, Bloemfontein 9300, South Africa;