1. Center for Infectious Diseases, Virology University Hospital Heidelberg Heidelberg Germany
2. Deutsches Zentrum für Infektionsforschung (DZIF), Partner Site Heidelberg Germany
3. Internal Medicine V University Hospital Heidelberg Heidelberg Germany
4. Robert‐Bosch‐Hospital Unit for Haematology, Oncology and Palliative Medicine Stuttgart Germany
5. Department of Infectious Diseases, Unit 17, Influenzaviruses and Other Viruses of the Respiratory Tract Robert Koch Institute Berlin Germany
6. Center for Childhood and Adolescent Medicine University Hospital Heidelberg Heidelberg Germany