1. Netherlands Institute for Health Services Research (Nederlands instituut voor onderzoek van de gezondheidszorg, NIVEL), Utrecht, the Netherlands
2. Réseau des Groupes Régionaux d’Observation de la Grippe (GROG), Open Rome, Paris, France
3. Department of General Practice, EMGO Institute for Health and Care Research, VU Medical Centre, Amsterdam, the Netherlands
4. The members of the European Influenza Surveillance Scheme (EISS) RSV Task Group are listed at the end of the article