The emergence and epidemic characteristics of the highly mutated SARS‐CoV‐2 Omicron variant

Abstract

Recently, the severe acute respiratory syndrome coronavirus 2 (SARS‐CoV‐2) Omicron variant (B.1.1.529) was first identified in Botswana in November 2021. It was first reported to the World Health Organization (WHO) on November 24. On November 26, 2021, according to the advice of scientists who are part of the WHO's Technical Advisory Group on SARS‐CoV‐2 Virus Evolution (TAG‐VE), the WHO defined the strain as a variant of concern (VOC) and named it Omicron. Compared to the other four VOCs (Alpha, Beta, Gamma, and Delta), the Omicron variant was the most highly mutated strain, with 50 mutations accumulated throughout the genome. The Omicron variant contains at least 32 mutations in the spike protein, which was twice as many as the Delta variant. Studies have shown that carrying many mutations can increase infectivity and immune escape of the Omicron variant compared with the early wild‐type strain and the other four VOCs. The Omicron variant is becoming the dominant strain in many countries worldwide and brings new challenges to preventing and controlling coronavirus disease 2019 (COVID‐19). The current review article aims to analyze and summarize information data about the biological characteristics of amino acid mutations, the epidemic characteristics, immune escape, and vaccine reactivity of the Omicron variant, hoping to provide a scientific reference for monitoring, prevention, and vaccine development strategies for the Omicron variant.

What Is New With Omicron Variant of SARS-CoV-2 in Children?

“…The World Health Organization (WHO) has classified the risk of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variant B.1.1.529 as very high since November 29. Omicron is designated as of concern [ 1 - 9 ]. This classification, according to the WHO definition, is a signal that a variant may be more contagious or lead to more severe disease [ 1 - 9 ].…”

“…Omicron is designated as of concern [ 1 - 9 ]. This classification, according to the WHO definition, is a signal that a variant may be more contagious or lead to more severe disease [ 1 - 9 ]. In addition, “variants of concern” risk makes conventional vaccines, drugs, or coronavirus measures less effective [ 1 , 6 , 8 , 9 ].…”

“…The WHO warns of the emergence of even more dangerous virus variants. The Omicron variant is massively on the rise [ 1 - 9 ]. At the moment, all indications are that it is even more infectious than the previously dominant, already highly contagious Delta variant.…”

“…At the moment, all indications are that it is even more infectious than the previously dominant, already highly contagious Delta variant. Vaccine manufacturers also believe that two doses will not provide complete protection against infection with Omicron, but will still provide protection against severe disease [ 1 , 6 , 8 , 9 ]. For the best possible protection, a third booster vaccination is mandatory.…”

“…The previous variants, Alpha and Delta, did not differentiate between ages. Because Omicron is even more easily transmissible, the virus variant can spread more quickly in the population than its predecessors [ 1 - 9 ]. This means that the risk of it hitting younger people increases.…”