Acknowledgements
Claudia
We are grateful to all study participants for their dedication to our research. We thank all members of all involved institutes. In particular, we thank Andrea Klöckner, Christian Overath, Anna Lucia Petrucci, Flaurant Ramadani, Claudia Reddig, Jasmin Lange, and Monika Eschbach-Bludau for processing serum samples and sample logistics. We thank Kanika Vanshylla for establishing the pseudovirus neutralization assay. We thank Thorsten Noack-Schönborn for providing data on emergency department patient characteristics. We thank Carsten Tschirner (IExcelU) for supporting data visualization and all laboratories providing SARS-CoV-2 sequencing information to GISAID and, subsequently, Our World in Data for facilitating variant distribution analyses. We acknowledge support for the Article Processing Charge from the DFG (German Research Foundation, 491454339). Funding was provided by the ministry for work, health, and social affairs of the state of North Rhine-Westphalia (CPS-1-1F).