![]() There were 132 asymptomatic infections (28.27%) and 335 (71.73%) symptomatic infections. Results: The median (Q1, Q3) age of 467 Omicron infections including 253 males (54.18%) was 26 (20, 39) years old. The latent period and incubation period were estimated by using log- normal distribution and gamma distribution models, and the associated factors were analyzed by using the accelerated failure time model (AFT). Methods: From January 1 to June 30, 2022, 467 infections and 335 symptomatic infections in five local Omicron variant outbreaks in China were selected as the study subjects. Li ZJ Chinese Center for Disease Control and Prevention, Beijing 102206, China.ĪBSTRACT Objective: To estimate the latent period and incubation period of Omicron variant infections and analyze associated factors.Li Y Division of Infectious Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing 102206, China.Qin Y Division of Infectious Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing 102206, China.Li D Division of Infectious Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing 102206, China.Gao F Division of Infectious Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing 102206, China.Ye Y Institute for Infectious Disease Prevention and Control,Henan Provincial Center for Disease Control and Prevention, Zhengzhou 450016, China.Lin M Guangxi Center for Disease Control and Prevention, Nanning 530028, China.Huang B Jilin Provincial Center for Disease Control and Prevention, Changchun 130062, China.Yang P Beijing Center for Disease Prevention and Control, Beijing 100013, China.Zhang YP Division of Infectious Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing 102206, China.Qiu Y Haidian District Center for Disease Control and Prevention,Beijing 100094, China.Jiang XL Division of Infectious Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing 102206, China.All lineages currently circulating are classified as part of the Omicron variant. SARS-CoV-2 lineages with similar characteristics may affect how fast the virus spreads, the severity of illness it causes, or the effectiveness of treatments against it some of these may be classified by the World Health Organization (WHO) or the U.S. All lineages have names to help scientists talk about them. The SARS-CoV-2 virus can be mapped out similar to a family tree. ![]() As genetic changes happen over time, the virus that causes COVID-19 begins to form genetic lineages. What You Need to Know About Variants | View Transcript Īs a virus spreads, it has a chance to change. Those variants must be monitored more carefully. Some variations allow the virus to spread more easily or make it resistant to treatments or vaccines. ![]() These small differences, or variants, have been studied and identified since the beginning of the pandemic. By comparing the branches, scientists can label them according to the differences. If you think about a virus like a tree growing and branching out, each branch on the tree is slightly different than the others.
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