1. Epiconcept, Paris, France
2. CIBER de Epidemiología y Salud Pública (CIBERESP), Institute of Health Carlos III, Madrid, Spain
3. National Centre for Microbiology, National Influenza Reference Laboratory, WHO-National Influenza Centre, Institute of Health Carlos III, Madrid, Spain
4. National Centre for Epidemiology, Institute of Health Carlos III, Madrid, Spain
5. Department for Infectious Disease Epidemiology, Respiratory Infections Unit, Robert Koch Institute, Berlin, Germany
6. Sorbonne Université, INSERM, Institut Pierre Louis d'épidémiologie et de Santé Publique (IPLESP UMRS 1136), Paris, France
7. HSE Health Protection Surveillance Centre, Dublin, Ireland
8. National Institute for Public Health and the Environment, Centre for Infectious Diseases Control, Bilthoven, the Netherlands
9. Epidemiology Department, Instituto Nacional de Saúde Doutor Ricardo Jorge, Lisbon, Portugal
10. Instituto de Salud Pública de Navarra – IdiSNA – CIBERESP, Pamplona, Spain
11. Croatian Institute of Public Health, Zagreb, Croatia
12. Public Health Agency of Sweden, Stockholm, Sweden
13. National Laboratory for Health Security, Epidemiology and Surveillance Centre, Semmelweis University, Budapest, Hungary
14. Cantacuzino National Military Medical Institute for Research and Development, Bucharest, Romania
15. Infectious Disease Prevention and Control Unit (IDCU), Health Promotion and Disease Prevention, Msida, Malta
16. Department of Infectious Diseases, CHU UCL Namur (site Godinne), Université catholique de Louvain, Yvoir, Belgium
17. National Reference Centre for Influenza, Robert Koch Institute, Berlin, Germany
18. Clinic of Infectious Diseases and Dermatovenerology, Institute of Clinical Medicine, Medical Faculty, Vilnius University, Vilnius, Lithuania
19. Dr Victor Babes Clinical Hospital of Infectious and Tropical Diseases, Bucharest, Romania
20. University Hospital Brno and Masaryk University, Brno, Czechia
21. Servicio de Vigilancia y Salud Laboral, Dirección General de Salud Pública y Ordenación Farmacéutica, Consejería de Salud y Consumo, Andalucía, Spain
22. Centre National de Référence Virus des Infections Respiratoire (CNR VIR), Institut Pasteur Université Paris Cité, Paris, France
23. National Virus Reference Laboratory, University College Dublin, Dublin, Ireland
24. Nivel, Utrecht, the Netherlands
25. Laboratório Nacional Referência Gripe e outros Vírus Respiratórios, Instituto Nacional de Saúde Doutor Ricardo Jorge, Lisbon, Portugal
26. Servicio de vigilancia y control epidemiológico, Subdirección general de Epidemiología y Vigilancia de la Salud, Dirección General de Salud pública, Valencia, Spain
27. Department of Child and Adolescent Health, Mater Dei Hospital, Msida, Malta
28. European Centre for Disease Prevention and Control, Stockholm, Sweden