Peter Bager
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View article: COVID-19 versus influenza burden in Denmark in the 2024–25 season
COVID-19 versus influenza burden in Denmark in the 2024–25 season Open
View article: Gene–Environment Interaction Affects Risk of Atopic Eczema: Population and In Vitro Studies
Gene–Environment Interaction Affects Risk of Atopic Eczema: Population and In Vitro Studies Open
Background Multiple environmental and genetic factors play a role in the pathogenesis of atopic eczema ( AE ). We aimed to investigate gene–environment interactions (G × E) to improve understanding of the pathophysiology. Methods We analys…
View article: Central role of glycosylation processes in human genetic susceptibility to SARS-CoV-2 infections with Omicron variants
Central role of glycosylation processes in human genetic susceptibility to SARS-CoV-2 infections with Omicron variants Open
The host genetics of SARS-CoV-2 has previously been studied based on cases from the earlier waves of the pandemic in 2020 and 2021, identifying 51 genomic loci associated with infection and/or severity. SARS-CoV-2 has shown rapid sequence …
View article: Post–COVID-19 Condition Fatigue Outcomes Among Danish Residents
Post–COVID-19 Condition Fatigue Outcomes Among Danish Residents Open
Importance Fatigue remains one of the most common and debilitating symptoms of post–COVID-19 condition; however, existing studies are limited to select populations and often lack noninfected controls. It also remains unclear to what extent…
View article: Physical activity, sedentary behaviour, and childhood asthma: a European collaborative analysis
Physical activity, sedentary behaviour, and childhood asthma: a European collaborative analysis Open
Objectives To investigate the associations of physical activity (PA) and sedentary behaviour in early childhood with asthma and reduced lung function in later childhood within a large collaborative study. Design Pooling of longitudinal dat…
View article: Cohort profile: EFTER-COVID – a Danish nationwide cohort for assessing the long-term health effects of the COVID-19 pandemic
Cohort profile: EFTER-COVID – a Danish nationwide cohort for assessing the long-term health effects of the COVID-19 pandemic Open
Purpose To follow SARS-CoV-2-infected persons up to 18 months after a positive test in order to assess the burden and nature of post acute symptoms and health problems. Participants Persons in Denmark above 15 years of age, who were tested…
View article: A register and questionnaire study of long-term general health symptoms following SARS-CoV-2 vaccination in Denmark
A register and questionnaire study of long-term general health symptoms following SARS-CoV-2 vaccination in Denmark Open
View article: Comparison of morbidity and mortality after bloodstream infection with vancomycin-resistant versus -susceptible <i>Enterococcus faecium: a</i> nationwide cohort study in Denmark, 2010–2019
Comparison of morbidity and mortality after bloodstream infection with vancomycin-resistant versus -susceptible <i>Enterococcus faecium: a</i> nationwide cohort study in Denmark, 2010–2019 Open
The emergence of bloodstream infections (BSI) caused by vancomycin-resistant Enterococci (VRE) has caused concern. Nonetheless, it remains unclear whether these types are associated with an excess risk of severe outcomes when compared with…
View article: The effectiveness of pollen allergen immunotherapy on allergic rhinitis over 18 years: A national cohort study in Denmark
The effectiveness of pollen allergen immunotherapy on allergic rhinitis over 18 years: A national cohort study in Denmark Open
Background Because long‐term effectiveness of pollen allergen immune therapy (AIT) for allergic rhinitis (AR) is not well‐described, we studied effectiveness over 18 years in Denmark. Methods A register‐based cohort study using data on fil…
View article: Relative Vaccine Protection, Disease Severity and Symptoms Associated with Infection with SARS-CoV-2 Omicron Subvariant Ba.2.86 and Descendent Jn.1: A Danish Nationwide Register-Based Study
Relative Vaccine Protection, Disease Severity and Symptoms Associated with Infection with SARS-CoV-2 Omicron Subvariant Ba.2.86 and Descendent Jn.1: A Danish Nationwide Register-Based Study Open
View article: Postacute symptoms 4 months after SARS-CoV-2 infection during the Omicron period: a nationwide Danish questionnaire study
Postacute symptoms 4 months after SARS-CoV-2 infection during the Omicron period: a nationwide Danish questionnaire study Open
Postacute symptoms are not uncommon after severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection with pre-Omicron variants. How the Omicron variant and coronavirus disease 2019 (COVID-19) booster vaccination influence the r…
View article: A Danish questionnaire study of acute symptoms of SARS-CoV-2 infection by variant, vaccination status, sex and age
A Danish questionnaire study of acute symptoms of SARS-CoV-2 infection by variant, vaccination status, sex and age Open
It is not well-described how the acute symptoms of infection with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) differ by variant, vaccination, sex and age. A cross-sectional questionnaire study linked to national testing- a…
View article: A hybrid register and questionnaire study of Covid-19 and post-acute sick leave in Denmark
A hybrid register and questionnaire study of Covid-19 and post-acute sick leave in Denmark Open
View article: A standardised protocol for relative SARS-CoV-2 variant severity assessment, applied to Omicron BA.1 and Delta in six European countries, October 2021 to February 2022
A standardised protocol for relative SARS-CoV-2 variant severity assessment, applied to Omicron BA.1 and Delta in six European countries, October 2021 to February 2022 Open
Several SARS-CoV-2 variants that evolved during the COVID-19 pandemic have appeared to differ in severity, based on analyses of single-country datasets. With decreased testing and sequencing, international collaborative studies will become…
View article: Clinical progression, disease severity, and mortality among adults hospitalized with COVID-19 caused by the Omicron and Delta SARS-CoV-2 variants: A population-based, matched cohort study
Clinical progression, disease severity, and mortality among adults hospitalized with COVID-19 caused by the Omicron and Delta SARS-CoV-2 variants: A population-based, matched cohort study Open
Background To compare the intrinsic virulence of the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) omicron variant with the delta variant in hospitalized adults with coronavirus disease 2019 (COVID-19). Methods All adults ho…
View article: Covid-19 and post-acute sick leave: a hybrid register and questionnaire study in the adult Danish population
Covid-19 and post-acute sick leave: a hybrid register and questionnaire study in the adult Danish population Open
Long covid follows 10-20% of first-time SARS-CoV-2 infections, but the societal burden of long covid and risk factors for the condition are not well-understood. Here, we report findings about self-reported sick leave and risk factors there…
View article: A standardised protocol for assessment of relative SARS-CoV-2 variant severity, with application to severity risk for COVID-19 cases infected with Omicron BA.1 compared to Delta variants in six European countries
A standardised protocol for assessment of relative SARS-CoV-2 variant severity, with application to severity risk for COVID-19 cases infected with Omicron BA.1 compared to Delta variants in six European countries Open
Several SARS-CoV-2 variants that evolved during the COVID-19 pandemic have appeared to differ in severity, based on analyses of single-country datasets. With decreased SARS-CoV-2 testing and sequencing, international collaborative studies …
View article: Conflicting COVID-19 excess mortality estimates
Conflicting COVID-19 excess mortality estimates Open
View article: A Standardised Protocol for Assessment of Relative SARS-CoV-2 Variant Severity, with Application to Severity Risk for COVID-19 Cases Infected with Omicron BA.1 Compared to Delta Variants in six European Countries
A Standardised Protocol for Assessment of Relative SARS-CoV-2 Variant Severity, with Application to Severity Risk for COVID-19 Cases Infected with Omicron BA.1 Compared to Delta Variants in six European Countries Open
View article: Acute Symptoms of SARS-CoV-2 Infection by Variant, Vaccination Status, Sex and Age: A Questionnaire Study in Denmark
Acute Symptoms of SARS-CoV-2 Infection by Variant, Vaccination Status, Sex and Age: A Questionnaire Study in Denmark Open
View article: The effectiveness of grass, birch, and mugwort pollen allergen immunotherapy over 18 years: A national cohort study in Denmark
The effectiveness of grass, birch, and mugwort pollen allergen immunotherapy over 18 years: A national cohort study in Denmark Open
Background Long-term effectiveness of pollen allergen immune therapy (AIT) for allergic rhinitis (AR) has been studied for different durations. We studied effectiveness over 18 years using nationwide register-data for Denmark. Methods A re…
View article: Risk of reinfection, vaccine protection, and severity of infection with the BA.5 omicron subvariant: a nation-wide population-based study in Denmark
Risk of reinfection, vaccine protection, and severity of infection with the BA.5 omicron subvariant: a nation-wide population-based study in Denmark Open
View article: WITHDRAWN: Post-acute symptoms four months after SARS-CoV-2 infection during the Omicron period: a nationwide Danish questionnaire study
WITHDRAWN: Post-acute symptoms four months after SARS-CoV-2 infection during the Omicron period: a nationwide Danish questionnaire study Open
Withdrawal Statement This manuscript has been removed because it included data obtained through a copyrighted questionnaire. The survey described in the manuscript was launched in haste during the pandemic and the authors were not aware of…
View article: A nationwide questionnaire study of post-acute symptoms and health problems after SARS-CoV-2 infection in Denmark
A nationwide questionnaire study of post-acute symptoms and health problems after SARS-CoV-2 infection in Denmark Open
View article: Observed protection against SARS-CoV-2 reinfection following a primary infection: A Danish cohort study among unvaccinated using two years of nationwide PCR-test data
Observed protection against SARS-CoV-2 reinfection following a primary infection: A Danish cohort study among unvaccinated using two years of nationwide PCR-test data Open
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View article: Risk of hospitalisation associated with infection with SARS-CoV-2 omicron variant versus delta variant in Denmark: an observational cohort study
Risk of hospitalisation associated with infection with SARS-CoV-2 omicron variant versus delta variant in Denmark: an observational cohort study Open
View article: Post-acute symptoms, new onset diagnoses and health problems 6 to 12 months after SARS-CoV-2 infection: a nationwide questionnaire study in the adult Danish population
Post-acute symptoms, new onset diagnoses and health problems 6 to 12 months after SARS-CoV-2 infection: a nationwide questionnaire study in the adult Danish population Open
Background A considerable number of individuals infected with SARS-CoV-2 continue to experience symptoms after the acute phase. More information on duration and prevalence of these symptoms in non-hospitalized populations is needed. Method…
View article: Reduced Risk of Hospitalisation Associated With Infection With SARS-CoV-2 Omicron Relative to Delta: A Danish Cohort Study
Reduced Risk of Hospitalisation Associated With Infection With SARS-CoV-2 Omicron Relative to Delta: A Danish Cohort Study Open
View article: Self-Reported Adverse Events Following SARS-CoV-2 Vaccination: A Nationwide Questionnaire Study in the Adult Danish Population
Self-Reported Adverse Events Following SARS-CoV-2 Vaccination: A Nationwide Questionnaire Study in the Adult Danish Population Open
View article: Observed Protection Against SARS-CoV-2 Reinfection Following a Primary Infection: A Danish Cohort Study Using Two Years of Nationwide PCR-Test Data
Observed Protection Against SARS-CoV-2 Reinfection Following a Primary Infection: A Danish Cohort Study Using Two Years of Nationwide PCR-Test Data Open