Nikolaj Ulrik Friis

Vaccine effectiveness against SARS-CoV-2 infection or COVID-19 hospitalization with the Alpha, Delta, or Omicron SARS-CoV-2 variant: A nationwide Danish cohort study

Mie Agermose Gram, Hanne‐Dorthe Emborg, Astrid Blicher Schelde et al. · PLoS Medicine · 2022 · 148 citations · Full text

Risk of reinfection, vaccine protection, and severity of infection with the BA.5 omicron subvariant: a nation-wide population-based study in Denmark

Christian Holm Hansen, Nikolaj Ulrik Friis, Peter Bager et al. · The Lancet Infectious Diseases · 2022 · 105 citations · Full text

Vaccination, Preventive Medicine, Vaccine Research +8

COVID-19 mortality attenuated during widespread Omicron transmission, Denmark, 2020 to 2022

Nikolaj Ulrik Friis, Tomas Martin-Bertelsen, Rasmus Kristoffer Pedersen et al. · Eurosurveillance · 2023 · 27 citations · Full text

Vaccine effectiveness against SARS-CoV-2 infection and COVID-19-related hospitalization with the Alpha, Delta and Omicron SARS-CoV-2 variants: a nationwide Danish cohort study

Mie Agermose Gram, Hanne‐Dorthe Emborg, Astrid Blicher Schelde et al. · 2022 · 26 citations · Full text

Immunodeficiencies, Covid-19 Epidemiology, Delta Variant +18

Risk of Reinfection, Vaccine Protection, and Severity of Infection with the BA.5 Omicron Subvariant: A Danish Nation-Wide Population-Based Study

Christian Holm Hansen, Nikolaj Ulrik Friis, Peter Bager et al. · SSRN Electronic Journal · 2022 · 21 citations · Full text