With the continuation of the pandemic, many severe acute respiratory syndrome coronavirus
2 (SARS-CoV-2) variants have appeared around the world. Owing to a possible risk of …

Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is a virus that belongs to
the coronavirus family and is the cause of coronavirus disease 2019 (COVID-19). As of May …

The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) Gamma variant of
concern has spread rapidly across Brazil since late 2020, causing substantial infection and …

New SARS-CoV-2 may pose problems in controlling the COVID-19 pandemic for public
health. We aimed to assess and compare the symptoms and severity of cases due to the …

The advent of SARS-CoV-2 variants may cause resistance at the immunity level against
current vaccines. Some emergent new variants have increased transmissibility, infectivity …

Once the first SARS-CoV-2 vaccine became available, mass vaccination was the main pillar
of the public health response to the COVID-19 pandemic. It was very effective in reducing …

Epidemiological data demonstrate that Severe Acute Respiratory Syndrome Coronavirus 2
(SARS-CoV-2) variants of concern (VOCs) Alpha and Delta are more transmissible …

Objectives To determine how the intrinsic severity of successively dominant SARS-CoV-2
variants changed over the course of the pandemic. Methods A retrospective cohort analysis …

The COVID-19 pandemic has been fueled by SARS-CoV-2 novel variants of concern (VOC)
that have increased transmissibility, receptor binding affinity, and other properties that …

Background The COVID-19 vaccine supply shortage in 2021 constrained roll-out efforts in
Africa while populations experienced waves of epidemics. As supply improves, a key …