University of Zurich - Viral Immunobiology, University of Zurich - Viral Immunobiology, University of Zurich - Viral Immunobiology, University of Massachusetts Worcester - Division of Infectious Diseases and Immunology, Kenya Medical Research Institute (KEMRI) - Center for Global Health Research, University of Massachusetts Worcester - Division of Infectious Diseases and Immunology, University of Zurich - Viral Immunobiology, University of Zurich - Viral Immunobiology, German Center of Infection Research (DZIF), University of Surrey - School of Biosciences and Medicine, University of Zurich - Cellular Immunotherapy, University of Massachusetts Worcester - Division of Infectious Diseases and Immunology and University of Zurich - Viral Immunobiology