Division of Laboratory Medicine, Department of Diagnostics and of Medical Specialties, Geneva University Hospitals and Geneva University, Geneva, Switzerland. Centre for Vaccinology, Department of Pathology and Immunology, University of Geneva, Geneva, Switzerland. Division of Intensive Care, Geneva University Hospitals and the University of Geneva Faculty of Medicine, Geneva, Switzerland. Faculty of Science, Department of Organic Chemistry, NCCR Chemical Biology, University of Geneva, Geneva, Switzerland. Division and Department of Primary Care Medicine, Geneva University Hospitals, Geneva, Switzerland. Faculty of BioMedicine, Università della Svizzera Italiana, Lugano, Switzerland. Faculty of Medicine, Department of Pathology and Immunology, University of Geneva, Switzerland. Faculty of Medicine, Departments of Pathology-Immunology and Pediatrics, University of Geneva, Geneva, Switzerland. Geneva Centre for Emerging Viral Diseases, Geneva University Hospitals, Geneva, Switzerland. Unit of Population Epidemiology, Division of Primary Care, Geneva University Hospitals, Geneva, Switzerland. Division of Infectious Diseases, Department of Medicine, Geneva University Hospitals, Geneva, Switzerland.