Objectives To study clinical disease outcomes in both human and animal models to
understand the pathogenicity of omicron compared to the delta variant. Methods In this cross …

Background Although the SARS-CoV-2 Omicron variant is considered to induce less severe
disease, there have been no consistent results on the extent of the decrease in severity …

Background Globally, as of 23rd May 2022, there have been over 522,000,000 confirmed
cases and more than 6.2 million deaths from COVID-19 (1). On 25 November 2021, South …

Background Understanding the disease severity associated with the Omicron variant of the
SARS-CoV-2 virus is important in determining appropriate management strategies at 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 …

We summarized through systematic review and meta-analysis of observational studies the
risk of mortality as well as severe illness of COVID-19 caused by omicron variant relative to …

Purpose Multiple variants of SARS-CoV-2 from Alpha to Omicron have an estimated 6.1
million deaths globally till date. These variants have been found to vary in transmissibility …

Summary Background SARS-CoV-2 Omicron variant is rampantly spreading across the
globe. We assessed the pathogenicity and immune response generated by BA. 1.1 sub …

Background Currently, as the omicron variant of severe acute respiratory syndrome
coronavirus 2 (SARS-CoV-2) surges amid the coronavirus disease 2019 (COVID-19) …

We read with interest the letter published recently by Costa et al. in the journal of Infection.
They analyzed the difference between the viral loads of the SARS-CoV-2 Alpha and Delta …