1. Medical Research Council (MRC)/Uganda Virus Research Institute (UVRI) and London School of Hygiene and Tropical Medicine (LSHTM) Uganda Research Unit, Entebbe, Uganda.
2. Department of Medical Microbiology, College of Health Sciences, Makerere University, Kampala, Uganda.
3. Department of Immunology and Molecular Biology, College of Health Sciences, Makerere University, Kampala, Uganda.
4. London School of Hygiene and Tropical Medicine, London, United Kingdom.
5. Uganda Virus Research Institute, Entebbe, Uganda.