Testing Denmark: a Danish Nationwide Surveillance Study of COVID-19
Kamille Fogh, Jarl Emanuel Strange, Bibi F. S. S. Scharff, Alexandra R. R. Eriksen, Rasmus Bo Hasselbalch, Henning Bundgaard, Susanne Dam Nielsen, Charlotte Sværke Jørgensen, Christian Erikstrup, Jakob Norsk, Pernille Brok Nielsen, Jonas Henrik Kristensen, Lars Østergaard, Svend Ellermann‐Eriksen, Berit Andersen, Henrik Nielsen, Işık Somuncu Johansen, Lothar Wiese, Lone Simonsen, Thea Kølsen Fischer, Fredrik Folke, Freddy Lippert, Sisse Rye Ostrowski, Thomas Benfield, Kåre Mølbak, Steen Ethelberg, Anders Koch, Ute Wolff Sönksen, Anne‐Marie Vangsted, Tyra Grove Krause, Anders Fomsgaard, Henrik Ullum, Robert Skov, Kasper Iversen
Abstract
To date, including 318,522 participants, this is the largest population-based study with broad national participation where tests and questionnaires have been sent to participants' homes. We found that more emphasis from national and local authorities toward the risk of infection should be placed on age of tested individuals, type of occupation, as well as exposure in local communities and households. To meet the challenge that broad nationwide information can be difficult to gather. This study design sets the stage for a novel way of conducting studies. Additionally, this study design can be used as a supplementary model in future general test strategy for ongoing monitoring of COVID-19 immunity in the population, both from past infection and from vaccination against SARS-CoV-2, however, with attention to the complexity of performing and reading the POCT at home.