Changchun epidemic is Omicrovirus. Omicron (English name: Omicron, serial number: B. 1. 1.529), 20 19 novel coronavirus variety. It was first detected in South Africa on 202 1, 1654381October 9. The longest incubation period is 8 days. 2021165438+1On October 26th, the World Health Organization defined it as the fifth variant of concern and named it the Greek letter Omicron. 165438+129 October, WHO said that the overall risk assessment of COVID-19 Omicron mutant is very high in the world, and it may be widely spread around the world. On February 9th, 65438, according to a report published on the British Guardian website, scientists discovered an invisible version of Omicron strain which is more difficult to trace. On June 4th, 2022, WHO indicated that 128 countries and regions had reported the discovery of Omicron mutant before Christmas and New Year holidays.