Frontiers in Public Health (Dec 2022)
How fast and how well the Omicron epidemic was curtailed. A Guangzhou experience to share
- Wenfeng Cai,
- Zifeng Yang,
- Zifeng Yang,
- Zifeng Yang,
- Zifeng Yang,
- Jingyi Liang,
- Jingyi Liang,
- Jingyi Liang,
- Zhengshi Lin,
- Yu Ma,
- Chun Chen,
- Yan Li,
- Yongming Li,
- Yongming Li,
- Zhitong Mai,
- Zhitong Mai,
- Zhitong Mai,
- Kailin Mai,
- Kailin Mai,
- Xuetao Kong,
- Xingyi Liang,
- Qianying Li,
- Chuanmeizi Tu,
- Chuanmeizi Tu,
- Canxiong Chen,
- Chitin Hon,
- Pengzhe Qin,
- Ke Li,
- Xiaoning Li,
- Yutian Miao,
- Xuexing Liu,
- Wenda Guan,
- Wenda Guan,
- Zhiqi Zeng,
- Zhiqi Zeng,
- Wanli Qiu,
- Wei He,
- Lin Zhang,
- Zhicong Yang,
- Nanshan Zhong,
- Nanshan Zhong
Affiliations
- Wenfeng Cai
- Institute of Public Health, Guangzhou Medical University & Guangzhou Center for Disease Control and Prevention, Guangzhou, Guangdong, China
- Zifeng Yang
- National Center for Respiratory Medicine, State Key Laboratory of Respiratory Disease & National Clinical Research Center for Respiratory Disease, Guangzhou Institute of Respiratory Health, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China
- Zifeng Yang
- Guangzhou Laboratory, Bio-Island, Guangzhou, China
- Zifeng Yang
- State Key Laboratory of Quality Research in Chinese Medicine, Macau Institute for Applied Research in Medicine and Health, Macau University of Science and Technology, Macao, Macau SAR, China
- Zifeng Yang
- Guangzhou Key Laboratory for Clinical Rapid Diagnosis and Early Warning of Infectious Diseases, Guangzhou, China
- Jingyi Liang
- National Center for Respiratory Medicine, State Key Laboratory of Respiratory Disease & National Clinical Research Center for Respiratory Disease, Guangzhou Institute of Respiratory Health, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China
- Jingyi Liang
- Guangzhou Laboratory, Bio-Island, Guangzhou, China
- Jingyi Liang
- Macau Institute of Systems Engineering, Macau University of Science and Technology, Macao, Macau SAR, China
- Zhengshi Lin
- Guangdong Center for Disease Control and Prevention, Guangzhou, Guangdong, China
- Yu Ma
- Institute of Public Health, Guangzhou Medical University & Guangzhou Center for Disease Control and Prevention, Guangzhou, Guangdong, China
- Chun Chen
- Institute of Public Health, Guangzhou Medical University & Guangzhou Center for Disease Control and Prevention, Guangzhou, Guangdong, China
- Yan Li
- Macau Institute of Systems Engineering, Macau University of Science and Technology, Macao, Macau SAR, China
- Yongming Li
- National Center for Respiratory Medicine, State Key Laboratory of Respiratory Disease & National Clinical Research Center for Respiratory Disease, Guangzhou Institute of Respiratory Health, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China
- Yongming Li
- Guangzhou Laboratory, Bio-Island, Guangzhou, China
- Zhitong Mai
- National Center for Respiratory Medicine, State Key Laboratory of Respiratory Disease & National Clinical Research Center for Respiratory Disease, Guangzhou Institute of Respiratory Health, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China
- Zhitong Mai
- Guangzhou Laboratory, Bio-Island, Guangzhou, China
- Zhitong Mai
- State Key Laboratory of Quality Research in Chinese Medicine, Macau Institute for Applied Research in Medicine and Health, Macau University of Science and Technology, Macao, Macau SAR, China
- Kailin Mai
- National Center for Respiratory Medicine, State Key Laboratory of Respiratory Disease & National Clinical Research Center for Respiratory Disease, Guangzhou Institute of Respiratory Health, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China
- Kailin Mai
- Guangzhou Laboratory, Bio-Island, Guangzhou, China
- Xuetao Kong
- National Center for Respiratory Medicine, State Key Laboratory of Respiratory Disease & National Clinical Research Center for Respiratory Disease, Guangzhou Institute of Respiratory Health, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China
- Xingyi Liang
- Shunde Urban and Rural Planning Information Research Center, Foshan, Guangdong, China
- Qianying Li
- National Center for Respiratory Medicine, State Key Laboratory of Respiratory Disease & National Clinical Research Center for Respiratory Disease, Guangzhou Institute of Respiratory Health, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China
- Chuanmeizi Tu
- National Center for Respiratory Medicine, State Key Laboratory of Respiratory Disease & National Clinical Research Center for Respiratory Disease, Guangzhou Institute of Respiratory Health, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China
- Chuanmeizi Tu
- Guangzhou Laboratory, Bio-Island, Guangzhou, China
- Canxiong Chen
- National Center for Respiratory Medicine, State Key Laboratory of Respiratory Disease & National Clinical Research Center for Respiratory Disease, Guangzhou Institute of Respiratory Health, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China
- Chitin Hon
- Macau Institute of Systems Engineering, Macau University of Science and Technology, Macao, Macau SAR, China
- Pengzhe Qin
- Institute of Public Health, Guangzhou Medical University & Guangzhou Center for Disease Control and Prevention, Guangzhou, Guangdong, China
- Ke Li
- Institute of Public Health, Guangzhou Medical University & Guangzhou Center for Disease Control and Prevention, Guangzhou, Guangdong, China
- Xiaoning Li
- Institute of Public Health, Guangzhou Medical University & Guangzhou Center for Disease Control and Prevention, Guangzhou, Guangdong, China
- Yutian Miao
- Institute of Public Health, Guangzhou Medical University & Guangzhou Center for Disease Control and Prevention, Guangzhou, Guangdong, China
- Xuexing Liu
- Institute of Public Health, Guangzhou Medical University & Guangzhou Center for Disease Control and Prevention, Guangzhou, Guangdong, China
- Wenda Guan
- National Center for Respiratory Medicine, State Key Laboratory of Respiratory Disease & National Clinical Research Center for Respiratory Disease, Guangzhou Institute of Respiratory Health, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China
- Wenda Guan
- Guangzhou Laboratory, Bio-Island, Guangzhou, China
- Zhiqi Zeng
- National Center for Respiratory Medicine, State Key Laboratory of Respiratory Disease & National Clinical Research Center for Respiratory Disease, Guangzhou Institute of Respiratory Health, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China
- Zhiqi Zeng
- Guangzhou Laboratory, Bio-Island, Guangzhou, China
- Wanli Qiu
- Institute of Public Health, Guangzhou Medical University & Guangzhou Center for Disease Control and Prevention, Guangzhou, Guangdong, China
- Wei He
- Macau Institute of Systems Engineering, Macau University of Science and Technology, Macao, Macau SAR, China
- Lin Zhang
- Guangdong Center for Disease Control and Prevention, Guangzhou, Guangdong, China
- Zhicong Yang
- Institute of Public Health, Guangzhou Medical University & Guangzhou Center for Disease Control and Prevention, Guangzhou, Guangdong, China
- Nanshan Zhong
- National Center for Respiratory Medicine, State Key Laboratory of Respiratory Disease & National Clinical Research Center for Respiratory Disease, Guangzhou Institute of Respiratory Health, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China
- Nanshan Zhong
- Guangzhou Laboratory, Bio-Island, Guangzhou, China
- DOI
- https://doi.org/10.3389/fpubh.2022.979063
- Journal volume & issue
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Vol. 10
Abstract
IntroductionSARS-CoV-2 has ravaged the world and undergone multiple mutations during the course of the COVID-19 pandemic. On 7 April 2022, an epidemic caused by SARS-CoV-2 Omicron (BA.2) variant broke out in Guangzhou, China, one of the largest transportation and logistical hubs of the country.MethodsTo fast curtained the Omicron epidemic, based on the routine surveillance on the risk population of SARS-CoV-2 infection, we identify key places of the epidemic and implement enhanced control measures against Omicron.ResultsTransmission characteristics of the Omicron variant were analyzed for 273 confirmed cases, and key places involved in this epidemic were fully presented. The median incubation time and the generation time were 3 days, and the reproduction number Rt was sharply increased with a peak of 4.20 within 2 days. We tried an all-out effort to tackle the epidemic in key places, and the proportion of confirmed cases increased from 61.17% at Stage 2 to 88.89% at Stage 4. Through delimited risk area management, 99 cases were found, and the cases were isolated in advance for 2.61 ± 2.76 days in a lockdown zone, 0.44 ± 1.08 days in a controlled zone, and 0.27 ± 0.62 days in a precautionary zone. People assigned with yellow code accounted for 30.32% (84/277) of confirmed COVID-19 cases, and 83.33% of them were detected positive over 3 days since code assignment. For the districts outside the epicenter, the implementation duration of NPIs was much shorter compared with the Delta epidemic last year.ConclusionBy blocking out transmission risks and adjusting measures to local epidemic conditions through the all-out effort to tackle the epidemic in key places, by delimiting risk area management, and by conducting health code management of the at-risk population, the Omicron epidemic could be contained quickly.
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