Background Estimates of the severity of the SARS-CoV-2 omicron variant (B. 1.1. 529) are
crucial to assess the public health impact associated with its rapid global dissemination. We …

Background The omicron variant (B. 1.1. 529) of SARS-CoV-2 has demonstrated partial
vaccine escape and high transmissibility, with early studies indicating lower severity of …

Background A rapid increase in incidence of the SARS-CoV-2 Omicron variant (sub-lineage
BA. 1) occurred in France in December 2021, while the Delta variant was prevailing since …

Background There is an urgent public health need to evaluate disease severity in adults
hospitalised with Delta and Omicron SARS-CoV-2 variant infections. However, limited data …

While it is now evident that Omicron is rapidly replacing Delta, due to a combination of
increased transmissibility and immune escape, it is less clear how the severity of Omicron …

Summary Background Introduction of the Omicron variant caused a steep rise in SARS-CoV-
2 infections despite high vaccination coverage in the Danish population. We used blood …

Abstract Objectives During 2022, Omicron became the dominant SARS-CoV-2 variant in
Europe. This study aims to assess the impact of such variant on severe disease from SARS …

Background The increase in SARS-CoV-2 infections in December 2021 was driven primarily
by the Omicron variant, which largely displaced the Delta over a three-week span. Outcomes …

Infections with the Omicron SARS-CoV-2 variant are rapidly increasing worldwide. Among
174,349 SARS-CoV-2-infected individuals (≥ 12 years), we observed an increased risk of S …

Summary Background The SARS-CoV-2 Omicron variant became a global concern due to
its rapid spread and displacement of the dominant Delta variant. We hypothesized that part …