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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.
The first highly publicized variant of the SARS-CoV-2 virus was called alpha (B.1.1.7). ... clinical trials found it provided inadequate protection against moderate to severe COVID-19 caused by ...
In a study examining COVID-19 infections, hospitalizations, and deaths in Nebraska after vaccination with the 2023-2024 vaccines that targeted the XBB.1.5 variant, researchers found that vaccine ...
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 ...
The CDC and WHO assessed that the "public health risk posed by this variant is low compared with other circulating variants". [23] Moderna and Pfizer have stated that their COVID-19 vaccines targeted at the omicron variant remain effective against BA.2.86 [ 24 ] and Novavax has stated its updated protein-based COVID-19 vaccine appears effective ...
False-colour transmission electron micrograph of a B.1.1.7 variant coronavirus. The variant's increased transmissibility is believed to be due to changes in the structure of the spike proteins, shown here in green. There are many thousands of variants of SARS-CoV-2, which can be grouped into the much larger clades. [142]
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 ...
KP.3.1.1 is still the dominant COVID-19 variant in the United States as it accounts for nearly 60% of positive cases, but the new XEC variant is not far behind, recent Centers for Disease Control ...
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