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Jul 14, 2022 · These new versions that keep appearing are called variants. Scientists identify them with Greek names, including Alpha, Beta, Gamma, Delta, and the latest variant – Omicron. These variants, too, make new versions of themselves, called subvariants. BA.4 and BA.5 are the newest subvariants of the Omicron variant – the most dominant variant today.
Sep 1, 2023 · It’s estimated that Delta caused more than twice as many infections as previous variants—in Connecticut, it was estimated to have been 80 to 90% more transmissible than the Alpha variant. In the U.S., in June 2021, after a steady decline in COVID-19 cases and hospitalizations, the arrival of Delta coincided with a rapid reversal of that trend.
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- kathy.katella-cofrancesco@yale.edu
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What are the newest subvariants of the Omicron variant?
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What are the new variants of Omicron?
Sep 1, 2023 · The variant of the SARS-CoV-2 virus that causes COVID-19 first surfaced in the United States toward the end of 2021 and spread like wildfire, spawning new sub-strains—some more transmissible than others. Now, multiple Omicron subvariants are driving most of the COVID-19 cases in the United States. The newest Omicron strain arrived in the ...
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- kathy.katella-cofrancesco@yale.edu
- Why Are There So Many Types of Omicron?
- Why Are The Sub-Variants A Big Deal?
- Is The Virus Mutating faster?
- What Other Tricks Does The Virus have?
- What Might We See in The Future?
All viruses, SARS-CoV-2 included, mutate constantly. The vast majority of mutations have little to no effect on the ability of the virus to transmit from one person to another or to cause severe disease. When a virus accumulates a substantial number of mutations, it’s considered a different lineage(somewhat like a different branch on a family tree)...
There is evidence these Omicron sub-variants – specifically BA.4 and BA.5 – are particularly effective at reinfecting peoplewith previous infections from BA.1 or other lineages. There is also concern these sub-variants may infect people who have been vaccinated. So we expect to see a rapid rise in COVID casesin the coming weeks and months due to re...
You’d think SARS-CoV-2 is a super-speedy front-runner when it comes to mutations. But the virus actually mutates relatively slowly. Influenza viruses, for example, mutate at least four times faster. SARS-CoV-2 does, however, have “mutational sprints” for short periods of time, our research shows. During one of these sprints, the virus can mutate fo...
Mutation is not the only way variants can emerge. The Omicron XE variantappears to have resulted from a recombination event. This is where a single patient was infected with BA.1 and BA.2 at the same time. This coinfection led to a “genome swap” and a hybrid variant. Other instances of recombination in SARS-CoV-2 have been reported between Delta an...
As long as the virus is circulating, we will continue to see new virus lineages and variants. As Omicron is the most common variant currently, it is likely we will see more Omicron sub-variants, and potentially, even recombinant lineages. Scientists will continue to track new mutations and recombination events (particularly with sub-variants). They...
Jul 7, 2022 · The most common symptoms of BA.4 and BA.5. In the U.K., where BA.4 and BA.5 also account for the majority of new Covid cases, the most common Covid symptoms last week were runny nose, sore throat ...
- Aria Bendix
Jan 5, 2023 · At the end of 2021, the BA.1 variant replaced the Delta one, and it was considered to be the leading causative agent of the fourth wave. Similarly, this BA.1 sub-variant was again replaced by BA.2, manifesting its dominance by April 2022 [33,34]. These two newly emerged sub-variants are the key factor responsible for the fifth wave of COVID-19.
Jul 1, 2022 · Many countries have also lifted their Covid restrictions, meaning people are mixing more, which gives the virus more chances to spread. BA.4 and BA.5 appear to be able to infect people even if ...
