COVID-19 Vaccine Effectiveness and Digital Pandemic Surveillance in Germany (eCOV Study): Web Application–Based Prospective Observational Cohort Study

Anna-Lena Lang   ^{1 *} , MD ;   Nils Hohmuth   ^{1, 2 *} , MD ;   Vukašin Višković   ¹ , MA ;   Stefan Konigorski   ^{3, 4, 5} , PhD ;   Stefan Scholz   ⁶ , PhD ;   Felix Balzer   ² , MD, PhD ;   Cornelius Remschmidt   ^{1 *} , MD, PD ;   Rasmus Leistner   ^{7 *} , MD, PD

¹ d4l Data4Life gGmbH, Potsdam, Germany

² Institute of Medical Informatics, Charité University Medicine Berlin, Berlin, Germany

³ Digital Health Center, Hasso Plattner Institute for Digital Engineering, Potsdam, Germany

⁴ Hasso Plattner Institute for Digital Health, Icahn School of Medicine at Mount Sinai, New York, NY, United States

⁵ Department of Statistics, Harvard University, Cambridge, MA, United States

⁶ Health Services Research and Health Economics, Martin Luther University Halle-Wittenberg, Halle Saale, Germany

⁷ Department of Gastroenterology, Infectiology and Rheumatology, Charité University Medicine Berlin, Berlin, Germany

*these authors contributed equally