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Omicron (B.1.1.529) is a variant of SARS-CoV-2 first reported to the World Health Organization (WHO) by the Network for Genomics Surveillance in South Africa on 24 November 2021. [ 10][ 11] It was first detected in Botswana and has spread to become the predominant variant in circulation around the world. [ 12]
On 26 November at an emergency meeting in Geneva, Switzerland WHO's Technical Advisory Group on SARS-CoV-2 Virus Evolution designated PANGO lineage B.1.1.529 a variant of concern (VOC) and gave it the designation Omicron (skipping Nu and Xi, the next letters in the Greek alphabet in keeping with its nomenclature protocol introduced for the Delta variant).
This decision was made to reflect that in February 2022, over 98% of all GISAID sequenced samples belonged to the Omicron family, within which much of the variants' evolution took place. [120] By 9 Februrary 2023, the category had been renamed as "Omicron variants under monitoring." [121]
With Alpha, Delta, Omicron, and more iterations, it’s normal to wonder how many COVID variants are there? Ahead, experts explain the evolution of COVID-19, and the latest variants of concern.
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A new version of omicron is dominant in the U.S. The coronavirus subvariant known as BA.5 accounted for nearly 54% of the country's Covid cases as of Saturday, according to the Centers for Disease ...
The evolution of the Omicron variant appeared to be more rapid than other variants. [55] Theories for the origin of the omicron variant include long-term circulation among humans outside areas where genetic surveillance was performed, mutation in an immunocompromised individual, or adaptation in an animal species after reverse zoonosis.
Omicron will become the dominant coronavirus variant in Europe by the start of 2022 and three to four weeks is needed to determine the severity of the COVID-19 it causes, the World Health ...