1. Centre for Emerging and Zoonotic Diseases, National Institute for Communicable Diseases, National Health Laboratory Service, Sandringham, South Africa
2. Department of Microbiology and Plant Pathology, Faculty of Natural and Agricultural Science, University of Pretoria, South Africa
3. Centre for Genome Sciences, United States Army Medical Research Institute of Infectious Diseases, Frederick, MD, USA
4. Centre for Viral Zoonoses, Department of Medical Virology, Faculty of Health Sciences, University of Pretoria, South Africa
5. Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa