1. Department of Medical Microbiology, KAVI Institute of Clinical Research, University of Nairobi, Nairobi, Kenya.
2. Department of Virology, University of Helsinki, Helsinki, Finland.
3. Department of Veterinary Biosciences, University of Helsinki, Helsinki, Finland.
4. Department of Geosciences and Geography, University of Helsinki, Helsinki, Finland.
5. Department of Pathology, Microbiology and Parasitology, University of Nairobi, Nairobi, Kenya.
6. Department of Biological Sciences, University of Arkansas, Fayetteville, Arkansas, USA.