1. Service of Immunology and Allergy, Department of Medicine, Lausanne University Hospital, University of Lausanne, Lausanne 1011, Switzerland.
2. School of Life Sciences, Ecole Polytechnique Fédérale de Lausanne, Lausanne 1015, Switzerland.
3. Department of Microbiology and Molecular Medicine, University of Geneva, Geneva 1211, Switzerland.
4. Institute of Microbiology, Lausanne University Hospital, University of Lausanne, Lausanne 1011, Switzerland.
5. Centre for Primary Care and Public Health, University of Lausanne, Lausanne 1011, Switzerland.
6. Swiss Tropical and Public Health Institute, University of Basel, Basel 4001, Switzerland.
7. Epidemiology, Biostatistics and Prevention Institute, University of Zurich, Zurich 8001, Switzerland.
8. Swiss Vaccine Research Institute, Lausanne University Hospital, University of Lausanne, Lausanne 1011, Switzerland.
9. VRI, Université Paris-Est Créteil, Faculté de Médicine, INSERM U955, Créteil 94010, France.