Challenges in Inferring Omicron's Severity Omicron's spread in South Africa has led to fewer
hospitalizations and deaths per documented case than were seen during previous waves …

Introduction COVID-19 vaccines have been highly effective in reducing morbidity and
mortality during the pandemic. However, the emergence of the Omicron variant and …

Objectives To compare severity and clinical outcomes from Omicron as compared with the
Delta variant and to compare outcomes between Omicron sublineages. Methods We …

Objectives Because of the spread of the Omicron variant, many countries have experienced
COVID-19 case numbers unseen since the start of the pandemic. We aimed to compare the …

SARS‐CoV‐2 Omicron variant seemed to cause milder disease compared to previous
predominated variants. We aimed to conduct a meta‐analysis to assess the pooled …

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 …

Background: Asymptomatic infections are potential sources of transmission for coronavirus
disease 2019, especially during the epidemic of the SARS-CoV-2 Omicron variant. We …

Since the emergence of COVID 19, the authentic SARS-CoV-2 has evolved into a range of
novel variants that are of more global concern. In late November 2021, the Omicron (lineage …

Background The global surge in the omicron (B. 1.1. 529) variant has resulted in many
individuals with hybrid immunity (immunity developed through a combination of SARS-CoV …

Background People with immune dysfunction are at higher risk of severe outcomes from
COVID-19 infection, but relatively little epidemiologic information is available for mostly …