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A British Omicron case-control observational study until March 2022 showed a reduction in odds of long COVID with the Omicron variant versus the Delta variant of 0·24–0·5 depending on age and time since vaccination. [283]
In the case of COVID-19, the virus has mutated multiple times, leading to variants like Alpha and Delta, and various subvariants of Omicron. “Variants that can infect people better or evade ...
Independently, Western researchers carried out similar analyses but labeled the ancestral type "A" and the derived type "B". The B-type mutated into further types including B.1, which is the ancestor of the major global variants of concern, labeled in 2021 by the WHO as alpha, beta, gamma, delta and omicron variants. [8] [9] [10]
Research has shown that that people with PCR-confirmed Omicron are 15 to 20% less likely to require an admission to hospital. Omicron variant is less severe than Delta, early studies suggest Skip ...
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. The Delta variant was named on 31 May 2021 and had spread to over 179 countries by 22 November 2021.
The data analysed by Imperial College was based on 333,000 cases, including 122,062 of Delta and 1,846 which were confirmed as the Omicron coronavirus variant through genome sequencing.
Indeed, early research suggested that though omicron spread much faster than the delta variant, it appeared to cause less severe disease. Full coverage of the Covid-19 pandemic
How Omicron and Delta will interact is not clear in these models, however, and furthermore the prospect of those major variants on top of influenza is of grave concern. [119] A smaller Omicron surge in spring is also possible.) [ 120 ] As it is, the variant is projected to become the dominant strain within a week.