Origin and basis of omicron:
There is no clear explanation for the origin of omicron, and evolutionary analyses of mutation loci suggest that omicron is unlikely to be derived from the Alpha, Beta, Delta, or Gamma strains of omicron, and that many of the mutation loci that are present in omicron are difficult to found in other known mutant strains.
There are three hypotheses for the origin of omicron***:
The first is that the strain has been hiding in South Africa for a long time, and was just not discovered before;
The second is that the neocoronavirus got into animals somewhere and evolved, and that humans were later infected; and
The third is that an earlier strain evolved in a person with a weakened immune system. evolved.
Omicron profile
Omicron (English name: Omicron, number: B.1.1.529), 2019 novel coronavirus variant. First detected as early as November 9, 2021 in South Africa. The maximum incubation period is 8 days. This variant strain is not known to have first appeared in South Africa, but the unusual phenomenon was noted in South Africa. It follows the discovery of a mass infection of a group of students in Pretoria, the capital of South Africa, where the outbreak quickly grew from a few infections to thousands of infections and spread to other South African cities.
November 27, 2021, the United Kingdom, Germany, Italy, Israel and other countries and regions found a new variant of the new crown "Omicron" (Omicron), the world's existing countries have different degrees of tightening the epidemic prevention measures. To prevent the spread of Omicron, a mutated strain of the new coronavirus, has become a new goal of global epidemic prevention.
The above content refers to Baidu Encyclopedia - Omicron