1. National Institute for Communicable Diseases, Sandringham, Republic of South Africa
2. Centers for Disease Control and Prevention, Atlanta, Georgia, USA
3. World Health Organization, Geneva, Switzerland
4. University of the Free State, Bloemfontein, South Africa
5. Tulane School of Public Health and Tropical Medicine, New Orleans, Louisiana, USA
6. Institut Pasteur, Lyon, France; **University of Antwerp, Antwerp, Belgium
7. University of Aarhus, Kongens Lyngby, Denmark
8. Conservation International, Cape Town, South Africa
9. Department of Health, Watsa, Democratic Republic of the Congo