Person-Centered Web-Based Mobile Health System (Symptoms) for Reporting Symptoms in COVID-19 Vaccinated Individuals: Observational Study of System, Users, and Symptoms

Emelie Gustafson Hedov   ¹ , MA ;   Fredrik Nyberg   ² , MPH, MD, PhD ;   Stefan Gustafsson   ¹ , PhD ;   Huiqi Li   ² , PhD ;   Magnus Gisslén   ^{3, 4, 5} , MD, PhD ;   Johan Sundström   ^{1, 6} , MD, PhD

¹ Department of Medical Sciences, Uppsala University, Uppsala, Sweden

² School of Public Health and Community Medicine, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden

³ Department of Infectious Diseases, Institute of Biomedicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden

⁴ Region Västra Götaland, Department of Infectious Diseases, Sahlgrenska University Hospital, Gothenburg, Sweden

⁵ Public Health Agency of Sweden, Solna, Sweden

⁶ The George Institute for Global Health, University of New South Wales, Sydney, Australia