Epidemiological analysis on 1 052 cases of COVID-19 in epidemic clusters
10.3760/cma.j.cn112338-20200301-00223
- VernacularTitle: 1 052例新型冠状病毒肺炎聚集性病例流行病学特征分析
- Author:
Hong GAN
1
;
Yi ZHANG
1
;
Min YUAN
2
;
Xiaoyan WU
1
;
Zhirong LIU
3
;
Meng LIU
1
;
Jiabing WU
3
;
Shaojun XU
1
;
Lei GONG
3
;
Honglyu XU
1
;
Fangbiao TAO
1
Author Information
1. Department of Maternal, Child and Adolescent Health, School of Public Health, Anhui Medical University, Key Laboratory of Population Health Across Life Cycle, Ministry of Education, Key Laboratory of Study on Abnormal Gametes and Reproductive Tract, National Health Commission, Hefei 230032, China
2. Center for Big Data Science in Health, School Health Service Management, Anhui Medical University, Hefei 230032, China
3. Department of Public Health Emergency Management and Acute Infectious Diseases Prevention, Anhui Provincial Center for Disease Control and Prevention, Hefei 230601, China
- Publication Type:Journal Article
- Keywords:
COVID-19;
Clustering;
Epidemiology
- From:Chinese Journal of Epidemiology
2020;41(5):E027-E027
- CountryChina
- Language:Chinese
-
Abstract:
Objective To understand the epidemiological characteristics of the cases of COVID-19 epidemic clusters, and explore the influence of family factors and social factors such as group activities on the spread of the disease. Methods The data of cases of COVID-19 epidemic clusters from 19 January, 2020 to 25 February, 2020 were collected from the official platforms of 36 cities in 6 provinces in China. Descriptive statistical methods, χ 2 test and curve fitting were used to analyze the epidemiological characteristics of the clustered cases. Results By 25 February, 2020, the data of 1 052 cases in 366 epidemic clusters were collected. In these clustered cases, 86.9%(914/1 050) occurred in families. Among the 1 046 cases with gender information, 513 were males (49.0%) and 533 were females (51.0%). The cases were mainly young adults between 18 and 59 years old, accounting for 68.5% (711/1 038). In the 366 epidemic clusters , the clusters in which the first confirmed cases with the history of sojourn in Wuhan or Hubei accounted for 47.0%(172/366). From 19 January to 3 February, 2020, the first confirmed cases with Wuhan or Hubei sojourn history accounted for 66.5%. From 4 to 25 February, the first confirmed cases who had Wuhan or Hubei sojourn history accounted for only 18.2%. The median of interval between the first generation case onset and the second generation case onset was 5 (2-8) days. The median of onset- diagnosis interval of the initial cases was 6 (3-9) days, and the median of onset-diagnosis interval of the secondary cases was 5 (3-8) days. Conclusions Epidemic clusters of COVID-19 were common in many cities outside Wuhan and Hubei. Close contact in family was one of the main causes for the spread of household transmission of the virus. After 4 February, the epidemic clusters were mainly caused by the first generation or second generation cases in local areas, and the time for diagnosis became shorter.
