In late 2020, after circulating for almost a year in the human population, severe acute
respiratory syndrome coronavirus 2 (SARS-CoV-2) exhibited a major step change in its …

Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has caused millions of
deaths and substantial morbidity worldwide. Intense scientific effort to understand the …

Since the outbreak of the coronavirus disease 2019 (COVID-19) pandemic, there have been
a few variants of the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), one of …

The continued evolution of SARS-CoV-2 has led to the emergence of several new Omicron
subvariants, including BQ. 1, BQ. 1.1, BA. 4.6, BF. 7, and BA. 2.75. 2. Here, we examine the …

The emergence of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variants
in the Omicron lineage has resulted in diminished Coronavirus Disease 2019 (COVID-19) …

The recent emergence of SARS-CoV-2 Omicron (B. 1.1. 529 lineage) variants possessing
numerous mutations has raised concerns of decreased effectiveness of current vaccines …

Soon after the emergence and global spread of the SARS-CoV-2 Omicron lineage BA. 1,
another Omicron lineage, BA. 2, began outcompeting BA. 1. The results of statistical analysis …

Since the appearance in the late of December 2019, SARS-CoV-2 is rapidly evolving and
mutating continuously, giving rise to various variants with variable degrees of infectivity and …

Abstract SARS-CoV-2 Delta and Omicron are globally relevant variants of concern. Although
individuals infected with Delta are at risk of developing severe lung disease, infection with …

Background Due to the national dynamic zero-COVID strategy in China, there were no
persistent local transmissions of SARS-CoV-2 in Beijing before December, 2022. However …