Comparison of incubation periods of infections of Omicron variants BA.2 and BF.7 in Beijing
10.3760/cma.j.cn112338-20230316-00153
- VernacularTitle:北京市新型冠状病毒Omicron BA.2和BF.7变异株感染者潜伏期特征分析
- Author:
Xiang XU
1
;
Yuxin CAI
;
Yonghong LIU
;
Ying SHEN
;
Yang PAN
;
Hui YAO
;
Xiaoli WANG
;
Peng YANG
Author Information
1. 北京市疾病预防控制中心北京全球健康中心办公室，北京 100013
- Keywords:
2019-nCoV;
Omicron variant;
Incubation period;
Epidemiological characteristics
- From:
Chinese Journal of Epidemiology
2023;44(9):1397-1401
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To understand the incubation periods of infections of Omicron variants BA.2 and BF.7 in two COVID-19 epidemics and related factors in Beijing and provide basic parameters for the establishment of 2019-nCoV dynamic transmission model.Methods:The COVID-19 cases with specific exposure time and onset time in the Omicron variant BA.2 infection epidemic in April 2022 and in the Omicron variant BF.7 infection epidemic in October 2022 in Beijing were included in the analysis. The rank-sum test was conducted to estimate the differences in the incubation period between two types of infections. The incubation period distribution of the Omicron variant infection was fitted by using Weibull, Gamma and lognormal distributions. Multivariate analysis of variance was conducted to assess the effects of age, sex, variant type and vaccination status on the incubation periods.Results:A total of 64 cases of variant BA.2 infection and 58 cases of variant BF.7 infection were included. The M( Q1,Q3) of the incubation period was 3.00 (3.00, 4.00) days for BA.2 infection and 3.00 (2.00, 3.25) days for BF.7 infection. The lognormal distribution was the best fit. Multivariate analysis of variance showed that there were some differences in the incubation periods between two types of infections of Omicron variants, and the incubation period of variant BF.7 infection was shorter than that of variant BA.2 infection. Conclusion:Omicron variant BF.7 infection had shorter incubation period compared with Omicron variant BA.2 infection.
