1. Viral Diseases, National Influenza Centre, Scientific Directorate of Infectious Diseases in Humans Sciensano Ukkel Belgium
2. Observational Clinical Trials, Scientific Directorate of infectious Diseases in Humans Sciensano Ukkel Belgium
3. Department of Internal Medicine and Infectiology, Universitair Ziekenhuis Brussel (UZB) Vrije Universiteit Brussel (VUB) Brussels Belgium
4. Department of Microbiology and Infection Control, Universitair Ziekenhuis Brussel (UZB) Vrije Universiteit Brussel (VUB) Brussels Belgium
5. AIMS Lab, Center for Neurosciences, Faculty of Medicine and Pharmacy Vrije Universiteit Brussel (VUB) Brussels Belgium
6. CHU UCL Namur, site Mont‐Godinne Yvoir Belgium
7. Infection Control and Clinical Laboratory Jessa Ziekenhuis Hasselt Belgium
8. Department of Immunology and Infection Hasselt University Hasselt Belgium
9. Infection Control Jessa Ziekenhuis Hasselt Belgium
10. Laboratory Site St‐Joseph Grand Hôpital de Charleroi Gilly Belgium
11. Laboratory Medicine AZ Sint‐Jan Brugge‐Oostende AV Bruges Belgium
12. Department of Infectious Diseases, Centre Hospitalier Universitaire Saint‐Pierre Université Libre de Bruxelles (ULB) Brussels Belgium
13. Institute for Medical Immunology, ULB Center for Research in Immunology (U‐CRI) Université Libre de Bruxelles (ULB) Brussels Belgium
14. School of Public Health Université Libre de Bruxelles (ULB) Brussels Belgium
15. Pediatrics Department, CHU Saint‐Pierre Université Libre de Bruxelles (ULB) Brussels Belgium
16. National Reference Center for Respiratory Pathogens, UZ Leuven University Hospitals Leuven Leuven Belgium
17. Laboratory of Clinical Microbiology, Department of Microbiology, Immunology and Transplantation KU Leuven Leuven Belgium
18. Department of Microbiology, Immunology and Transplantation, Rega Institute KU Leuven Leuven Belgium
19. Spatial Epidemiology Lab (SpELL) Université Libre de Bruxelles Brussels Belgium
20. Epidemiology and public Health, Epidemiology of Infectious Diseases Sciensano Brussels Belgium