ArticlePloS one2023
Patterns of testing in the extensive Danish national SARS-CoV-2 test set-up.
Article in PloS one, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 25 papers.
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Who cites it
25 citing papers in PubMed, 32 citations in OpenAlex.
- COVID-19 Rapid Antigen Tests With Self-Collected vs Health Care Worker-Collected Nasal and Throat Swab Specimens: A Randomized Clinical Trial.JAMA network open · 2023Trial
- SARS-CoV-2 infection and long-term risk of cardiovascular and renal morbidity.European heart journal open · 2026Article
- Children's Birthday Gatherings and SARS-CoV-2 Infection in Grandparents.JAMA network open · 2026Article
- Acute SARS-CoV-2 infection and self-reported post-acute cognitive dysfunctions from the Danish EFTER-COVID survey.Communications medicine · 2026Article
- SARS-CoV-2 reinfections and subsequent risk of hospital-diagnosed post-acute sequelae in Denmark (2020-2022): a nationwide cohort study.The Lancet regional health. Europe · 2026Article
- Central role of glycosylation processes in human genetic susceptibility to SARS-CoV-2 infections with Omicron variants.Nature genetics · 2026Article
- Short-term and long-term risk of death and readmission among adults aged 50+ years admitted with severe acute respiratory infections due to COVID-19, influenza or RSV in Denmark, 2022-2025.BMJ public health · 2026Article
- Postpartum hemorrhage after SARS-CoV-2 infection in pregnancy: A Scandinavian register-based cohort study.Acta obstetricia et gynecologica Scandinavica · 2025Article
- COVIDmeter - a questionnaire-based symptom monitoring system for the surveillance of COVID-19 in Denmark, 2020-2023.Epidemiology and infection · 2025Article
- Feasibility of mapping cross-country population coronavirus disease 2019 metrics in a federated design: learnings from a HealthData@EU Pilot use case.European journal of public health · 2025Observational
- Virus Monitoring in Denmark: A Community-Based Self-Sampling System to Surveil Respiratory Viruses and Associated Symptoms.Journal of medical virology · 2025Article
- Data for action - description of the automated COVID-19 surveillance system in Denmark and lessons learnt, January 2020 to June 2024.Epidemiology and infection · 2025Article
- Digital twin simulation modelling shows that mass testing and local lockdowns effectively controlled COVID-19 in Denmark.Communications medicine · 2024Article
- Post-COVID-19 Condition Fatigue Outcomes Among Danish Residents.JAMA network open · 2024Article
- Automated local lockdowns for SARS-CoV-2 epidemic control-assessment of effect by controlled interrupted time series analysis.IJID regions · 2024Article
- High-resolution epidemiological landscape from ~290,000 SARS-CoV-2 genomes from Denmark.Nature communications · 2024Article
- Short, stringent lockdowns halted SARS-CoV-2 transmissions in Danish municipalities.Scientific reports · 2024Article
- Article
- Cohort profile: EFTER-COVID - a Danish nationwide cohort for assessing the long-term health effects of the COVID-19 pandemic.BMJ open · 2024Article
- Development of a large-scale rapid LAMP diagnostic testing platform for pandemic preparedness and outbreak response.Biology methods & protocols · 2024Article
Corrections and comments
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Authors and funding
8 authors at 2 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundThe Danish national SARS-CoV-2 mass test system was among the most ambitious worldwide. We describe its set-up and analyse differences in patterns of testing per demography and time period in relation to the three waves of SARS-CoV-2 transmission in Denmark.
methodsWe included all reported PCR- and rapid antigen-tests performed between 27 February 2020 and 10 March 2022 among all residents aged 2 years or above. Descriptive statistics and Poisson regression models were used to analyse characteristics of individuals tested for SARS-CoV-2 using a national cohort study design.
resultsA total of 63.7 million PCR-tests and 60.0 million rapid antigen-tests were performed in the study period, testing 90.9% and 78.8% of the Danish population at least once by PCR or antigen, respectively. Female sex, younger age, Danish heritage and living in the capital area were all factors positively associated with the frequency of PCR-testing. The association between COVID-19 vaccination and PCR-testing changed from negative to positive over time.
conclusionWe provide details of the widely available, free-of-charge, national SARS-CoV-2 test system, which served to identify infected individuals, assist isolation of infectious individuals and contact tracing, and thereby mitigating the spread of SARS-CoV-2 in the Danish population. The test system was utilized by nearly the entire population at least once, and widely accepted across different demographic groups. However, demographic differences in the test uptake did exist and should be considered in order not to cause biases in studies related to SARS-CoV-2, e.g., studies of transmission and vaccine effectiveness.
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