Abstract Since SARS-CoV-2 BA. 5 (Omicron) emerged and spread in 2022, Omicron
lineages have markedly diversified. Here we review the evolutionary trajectories and …

Background Vaccines are critical cost-effective tools to control the coronavirus disease 2019
(COVID-19) pandemic. However, the emergence of variants of the severe acute respiratory …

Background The first COVID-19 vaccine outside a clinical trial setting was administered on
Dec 8, 2020. To ensure global vaccine equity, vaccine targets were set by the COVID-19 …

Background COVID-19 is associated with increased risks of neurological and psychiatric
sequelae in the weeks and months thereafter. How long these risks remain, whether they …

Objectives To characterize the clinical severity of covid-19 associated with the alpha, delta,
and omicron SARS-CoV-2 variants among adults admitted to hospital and to compare the …

Background The omicron variant (B. 1.1. 529) of SARS-CoV-2 has demonstrated partial
vaccine escape and high transmissibility, with early studies indicating lower severity of …

The emergence of SARS-CoV-2 variants of concern with progressively increased
transmissibility between humans is a threat to global public health. The Omicron variant of …

After the global spread of the SARS-CoV-2 Omicron BA. 2, some BA. 2 subvariants,
including BA. 2.9. 1, BA. 2.11, BA. 2.12. 1, BA. 4, and BA. 5, emerged in multiple countries …

The emergence of the Omicron variant of SARS-CoV-2 is an urgent global health concern. In
this study, our statistical modelling suggests that Omicron has spread more rapidly than the …

During the current coronavirus disease 2019 (COVID-19) pandemic, a variety of mutations
have accumulated in the viral genome of severe acute respiratory syndrome coronavirus 2 …