Latent period and incubation period with associated factors of COVID-19 caused by Omicron variant

To estimate the latent period and incubation period of Omicron variant infections and analyze associated factors. 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. The latent period and...

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Published inZhōnghuá yùfáng-yīxué zázhì Vol. 57; no. 5; p. 659
Main Authors Jiang, X L, Qiu, Y, Zhang, Y P, Yang, P, Huang, B, Lin, M, Ye, Y, Gao, F, Li, D, Qin, Y, Li, Y, Li, Z J
Format Journal Article
LanguageChinese
Published China 06.05.2023
Subjects
Adolescent
Adult
Asymptomatic Infections
Child
Child, Preschool
COVID-19
Humans
Infant
Infant, Newborn
Infectious Disease Incubation Period
Male
Middle Aged
SARS-CoV-2
Young Adult
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Summary:To estimate the latent period and incubation period of Omicron variant infections and analyze associated factors. 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. 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). The median ( , ) age of 467 Omicron infections including 253 males (54.18%) was 26 (20, 39) years old. There were 132 asymptomatic infections (28.27%) and 335 (71.73%) symptomatic infections. The mean latent period of 467 Omicron infections was 2.65 (95% : 2.53-2.78) days, and 98% of infections were positive for nucleic acid test within 6.37 (95% : 5.86-6.82) days after infection. The mean incubation period of 335 symptomatic infections was 3.40 (95% : 3.25-3.57) days, and 97% of them developed clinical symptoms within 6.80 (95%
ISSN:0253-9624
DOI:10.3760/cma.j.cn112150-20220926-00925