Epidemiologic surveillance has revealed decoupling of Coronavirus Disease 2019 (COVID-
19) hospitalizations and deaths from case counts after emergence of the Omicron (B. 1.1 …

ABSTRACT Background The Omicron (B. 1.1. 529) variant of SARS-CoV-2 has rapidly
achieved global dissemination, accounting for most infections in the United States by …

Omicron BA.1/1.1 SARS-CoV-2 Infection among Vaccinated Canadian Adults | New England
Journal of Medicine Skip to main content The New England Journal of Medicine homepage …

Introduction Early reports showed that Omicron (BA. 1) SARS-CoV-2 could be less severe.
However, the magnitude of risk reduction of hospitalization and mortality of Omicron (BA. 1) …

Among adults hospitalized with SARS-CoV-2 infection during Omicron predominance,
COVID-19 vaccination, including with a booster dose, was associated with lower likelihood …

The highly transmissible Omicron (B. 1.1. 529) variant of severe acute respiratory syndrome
coronavirus 2 (SARS-CoV-2) was first detected in late 2021. Initial Omicron waves were …

A new variant of SARS-CoV-2 (the virus that causes COVID-19), B. 1.1. 529 (Omicron)(1),
was first reported to the World Health Organization (WHO) by South Africa on November 24 …

Background The incidence of and risk factors for severe clinical outcomes with the Omicron
(B. 1.1. 529) SARS-CoV-2 variant have not been well-defined. Methods We conducted a …

Methods| We conducted a retrospective population-wide matched cohort study of patients
infected with the Omicron and Delta variants, using Ontario-wide data sets: Public Health …

Background Four severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variants
predominated in the United States since 2021. Understanding disease severity related to …