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The term variant of concern (VOC) for SARS-CoV-2, which causes COVID-19, is a category used for variants of the virus where mutations in their spike protein receptor binding domain (RBD) substantially increase binding affinity (e.g., N501Y) in RBD-hACE2 complex (genetic data), while also being linked to rapid spread in human populations ...
Delta (B.617.2) First identified in India in late 2020, the delta variant soon spread across the globe. It became the dominant variant of SARS-CoV-2 until the emergence of omicron in December 2021.
New COVID-19 variants continue to pop up. Experts explain how many COVID variants there are, important subvariants, and the evolution of SARS-CoV-2 virus.
Variation between testing programmes worldwide results in different ascertainment rates per country: not every SARS-CoV-2 infection, nor every COVID-19-related death, will be identified, while on the other hand some deaths may be wrongly attributed to COVID-19 (for example if all suspected COVID-19 deaths are counted as COVID-19 deaths, as ...
After a fairly quiet spring, COVID-19 cases are on the rise again in the U.S. and SARS-COV-2, the virus that causes COVID-19, keeps churning out new variants. The latest is a trio, KP.2, KP.3, and ...
Human-to-human transmission of SARS‑CoV‑2 was confirmed on 20 January 2020 during the COVID-19 pandemic. [ 16 ] [ 39 ] [ 40 ] [ 41 ] Transmission was initially assumed to occur primarily via respiratory droplets from coughs and sneezes within a range of about 1.8 metres (6 ft).
The Delta variant (B.1.617.2) was [3] [4] a variant of SARS-CoV-2, the virus that causes COVID-19. It was first detected in India on 5 October 2020. It was first detected in India on 5 October 2020. The Delta variant was named on 31 May 2021 and had spread to over 179 countries by 22 November 2021.
A lot has changed since SARS-CoV-2 (the virus responsible for COVID-19) appeared on the world stage four years ago.In 2020, the novel coronavirus infected and upended the daily lives of millions ...