Close Contacts, Infected Cases, and the Trends of SARS-CoV-2 Omicron Epidemic in Shenzhen, China.
Furong Li, Fengchao Liang, Bin Zhu, Xinxin Han, Shenying Fang, Jie Huang, Xuan Zou, Dongfeng Gu
Author Information
Furong Li: School of Public Health and Emergency Management, Southern University of Science and Technology, 1088 Xueyuan Avenue, Fuguang Community, Taoyuan Street, Nanshan District, Shenzhen 518055, China.
Fengchao Liang: School of Public Health and Emergency Management, Southern University of Science and Technology, 1088 Xueyuan Avenue, Fuguang Community, Taoyuan Street, Nanshan District, Shenzhen 518055, China. ORCID
Bin Zhu: School of Public Health and Emergency Management, Southern University of Science and Technology, 1088 Xueyuan Avenue, Fuguang Community, Taoyuan Street, Nanshan District, Shenzhen 518055, China. ORCID
Xinxin Han: School of Public Health and Emergency Management, Southern University of Science and Technology, 1088 Xueyuan Avenue, Fuguang Community, Taoyuan Street, Nanshan District, Shenzhen 518055, China. ORCID
Shenying Fang: School of Public Health and Emergency Management, Southern University of Science and Technology, 1088 Xueyuan Avenue, Fuguang Community, Taoyuan Street, Nanshan District, Shenzhen 518055, China.
Jie Huang: School of Public Health and Emergency Management, Southern University of Science and Technology, 1088 Xueyuan Avenue, Fuguang Community, Taoyuan Street, Nanshan District, Shenzhen 518055, China.
Xuan Zou: Shenzhen Center for Disease Control and Prevention, Shenzhen 518073, China.
Dongfeng Gu: School of Public Health and Emergency Management, Southern University of Science and Technology, 1088 Xueyuan Avenue, Fuguang Community, Taoyuan Street, Nanshan District, Shenzhen 518055, China.
(1) The overall trends of the number of daily close contacts and infected cases as well as their association during an epidemic of Omicron Variant of SARS-CoV-2 have been poorly described. (2) Methods: This study was to describe the trends during the epidemic of the Omicron variant of SARS-CoV-2 in Shenzhen, China, including the number of close contacts and infected cases as well as their ratios by days and stages (five stages). (3) Results: A total of 1128 infected cases and 80,288 close contacts were identified in Shenzhen from 13 February 2022 to 1 April 2022. Before the citywide lockdown (14 March), the number of daily close contacts and infected cases gradually increased. However, the numbers showed a decrease after the lockdown was imposed. The ratio of daily close contacts to daily infected cases ranged from 20.2:1 to 63.4:1 and reached the lowest during the lockdown period. The growth rate of daily close contacts was consistent with those of infected cases observed 6 days later to some extent. (4) Conclusions: The Omicron variant epidemic was promptly contained by tracing close contacts and taking subsequent quarantine measures.
