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How fast and how well the Omicron epidemic was curtailed. A Guangzhou experience to share
INTRODUCTION: SARS-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. ME...
Autores principales: | , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Frontiers Media S.A.
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9812567/ https://www.ncbi.nlm.nih.gov/pubmed/36620243 http://dx.doi.org/10.3389/fpubh.2022.979063 |
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author | Cai, Wenfeng Yang, Zifeng Liang, Jingyi Lin, Zhengshi Ma, Yu Chen, Chun Li, Yan Li, Yongming Mai, Zhitong Mai, Kailin Kong, Xuetao Liang, Xingyi Li, Qianying Tu, Chuanmeizi Chen, Canxiong Hon, Chitin Qin, Pengzhe Li, Ke Li, Xiaoning Miao, Yutian Liu, Xuexing Guan, Wenda Zeng, Zhiqi Qiu, Wanli He, Wei Zhang, Lin Yang, Zhicong Zhong, Nanshan |
author_facet | Cai, Wenfeng Yang, Zifeng Liang, Jingyi Lin, Zhengshi Ma, Yu Chen, Chun Li, Yan Li, Yongming Mai, Zhitong Mai, Kailin Kong, Xuetao Liang, Xingyi Li, Qianying Tu, Chuanmeizi Chen, Canxiong Hon, Chitin Qin, Pengzhe Li, Ke Li, Xiaoning Miao, Yutian Liu, Xuexing Guan, Wenda Zeng, Zhiqi Qiu, Wanli He, Wei Zhang, Lin Yang, Zhicong Zhong, Nanshan |
author_sort | Cai, Wenfeng |
collection | PubMed |
description | INTRODUCTION: SARS-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. METHODS: To 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. RESULTS: Transmission 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. CONCLUSION: By 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. |
format | Online Article Text |
id | pubmed-9812567 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | Frontiers Media S.A. |
record_format | MEDLINE/PubMed |
spelling | pubmed-98125672023-01-05 How fast and how well the Omicron epidemic was curtailed. A Guangzhou experience to share Cai, Wenfeng Yang, Zifeng Liang, Jingyi Lin, Zhengshi Ma, Yu Chen, Chun Li, Yan Li, Yongming Mai, Zhitong Mai, Kailin Kong, Xuetao Liang, Xingyi Li, Qianying Tu, Chuanmeizi Chen, Canxiong Hon, Chitin Qin, Pengzhe Li, Ke Li, Xiaoning Miao, Yutian Liu, Xuexing Guan, Wenda Zeng, Zhiqi Qiu, Wanli He, Wei Zhang, Lin Yang, Zhicong Zhong, Nanshan Front Public Health Public Health INTRODUCTION: SARS-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. METHODS: To 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. RESULTS: Transmission 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. CONCLUSION: By 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. Frontiers Media S.A. 2022-12-21 /pmc/articles/PMC9812567/ /pubmed/36620243 http://dx.doi.org/10.3389/fpubh.2022.979063 Text en Copyright © 2022 Cai, Yang, Liang, Lin, Ma, Chen, Li, Li, Mai, Mai, Kong, Liang, Li, Tu, Chen, Hon, Qin, Li, Li, Miao, Liu, Guan, Zeng, Qiu, He, Zhang, Yang and Zhong. https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. |
spellingShingle | Public Health Cai, Wenfeng Yang, Zifeng Liang, Jingyi Lin, Zhengshi Ma, Yu Chen, Chun Li, Yan Li, Yongming Mai, Zhitong Mai, Kailin Kong, Xuetao Liang, Xingyi Li, Qianying Tu, Chuanmeizi Chen, Canxiong Hon, Chitin Qin, Pengzhe Li, Ke Li, Xiaoning Miao, Yutian Liu, Xuexing Guan, Wenda Zeng, Zhiqi Qiu, Wanli He, Wei Zhang, Lin Yang, Zhicong Zhong, Nanshan How fast and how well the Omicron epidemic was curtailed. A Guangzhou experience to share |
title | How fast and how well the Omicron epidemic was curtailed. A Guangzhou experience to share |
title_full | How fast and how well the Omicron epidemic was curtailed. A Guangzhou experience to share |
title_fullStr | How fast and how well the Omicron epidemic was curtailed. A Guangzhou experience to share |
title_full_unstemmed | How fast and how well the Omicron epidemic was curtailed. A Guangzhou experience to share |
title_short | How fast and how well the Omicron epidemic was curtailed. A Guangzhou experience to share |
title_sort | how fast and how well the omicron epidemic was curtailed. a guangzhou experience to share |
topic | Public Health |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9812567/ https://www.ncbi.nlm.nih.gov/pubmed/36620243 http://dx.doi.org/10.3389/fpubh.2022.979063 |
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