University of Helsinki, University of Helsinki, University of Nairobi, University of Helsinki, University of Nairobi, University of Helsinki, University of Helsinki, University of Helsinki, University of Nairobi - KAVI-Institute for Clinical Research, University of Helsinki - Department of Virology and Immunology, University of Arkansas, University of Arkansas, Uppsala University, University of Helsinki, University of Helsinki, University of Helsinki, University of Helsinki and University of Helsinki - Department of Virology and Immunology