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 …

Abstract Background The Omicron SARS-CoV-2 variant is responsible for a major wave of
COVID-19, with record case counts reflecting high transmissibility and escape from prior …

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 …

Clinical features of SARS-CoV-2 Omicron variant infection, including incubation period and
transmission rates, distinguish this variant from preceding variants. However, whether the …

Recent studies indicated that the strong immune evasion potential of the most recent SARS-
CoV-2 variant, Omicron, results in more frequent reinfections and breakthrough infections …

Background The increase in SARS-CoV-2 infections in December 2021 in the United States
was driven primarily by the Omicron variant which largely displaced the Delta over a three …

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 …

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 …

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 …

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 …