1. Human Health Division, International Centre of Insect Physiology and Ecology, Nairobi, Kenya.
2. Zoonoses Research Unit, Department Medical Virology, University of Pretoria, Pretoria, South Africa.
3. Centre for Virus Research, Department of Medical Virology, Kenya Medical Research Institute, Nairobi, Kenya.
4. Global Disease Detection, US Centers for Disease Control and Prevention, Pretoria, South Africa.