| 张栋梁,陈奕,易波,王爱红,马晓,褚衍茹,雷松,张言武,李梦颖,许国章.2021年宁波市一起新型冠状病毒Delta变异株本土聚集性疫情流行特征分析[J].Chinese journal of Epidemiology,2022,43(9):1376-1380 |
| 2021年宁波市一起新型冠状病毒Delta变异株本土聚集性疫情流行特征分析 |
| Epidemiological characteristics of a local cluster epidemic caused by 2019-nCoV Delta variant in Ningbo,2021 |
| Received:February 14, 2022 |
| DOI：10.3760/cma.j.cn112338-20220214-00119 |
| KeyWord: 新型冠状病毒肺炎 新型冠状病毒 Delta变异株 聚集性疫情 流行特征 |
| English Key Word: COVID-19 2019-nCoV Delta variant Cluster epidemic Epidemiological characteristic |
| FundProject:宁波市科技重大专项(2020C5001);宁波市医疗卫生品牌学科(PPXK2018-10);国家自然科学基金(82073514);宁波市应急科技攻关重大专项(2022Z034) |
| Author Name | Affiliation | E-mail | | Zhang Dongliang | Department of Communicable Disease Control and Prevention, Ningbo Prefectural Center for Disease Control and Prevention, Ningbo 315010, China | | | Chen Yi | Department of Communicable Disease Control and Prevention, Ningbo Prefectural Center for Disease Control and Prevention, Ningbo 315010, China | | | Yi Bo | Department of Communicable Disease Control and Prevention, Ningbo Prefectural Center for Disease Control and Prevention, Ningbo 315010, China | | | Wang Aihong | Department of Communicable Disease Control and Prevention, Ningbo Prefectural Center for Disease Control and Prevention, Ningbo 315010, China | | | Ma Xiao | Department of Communicable Disease Control and Prevention, Ningbo Prefectural Center for Disease Control and Prevention, Ningbo 315010, China | | | Chu Yanru | Department of Communicable Disease Control and Prevention, Ningbo Prefectural Center for Disease Control and Prevention, Ningbo 315010, China | | | Lei Song | Department of Communicable Disease Control and Prevention, Ningbo Prefectural Center for Disease Control and Prevention, Ningbo 315010, China | | | Zhang Yanwu | Department of Communicable Disease Control and Prevention, Ningbo Prefectural Center for Disease Control and Prevention, Ningbo 315010, China | | | Li Mengying | Department of Communicable Disease Control and Prevention, Ningbo Prefectural Center for Disease Control and Prevention, Ningbo 315010, China | | | Xu Guozhang | Department of Communicable Disease Control and Prevention, Ningbo Prefectural Center for Disease Control and Prevention, Ningbo 315010, China | xugz@nbcdc.org.cn |
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| Abstract: |
| 目的 分析宁波市一起新型冠状（新冠）病毒Delta变异株本土聚集性疫情流行特征，为完善新型冠状病毒肺炎（COVID-19）疫情防控政策提供参考依据。方法 通过制定病例定义，开展病例搜索，对发现的病例开展现场流行病学调查，采集相关标本开展病原学检测，运用描述流行病学方法进行分析。结果 本起疫情累计报告74例确诊病例，病例以轻型为主，占87.84%（65/74），无重型和危重型。流行曲线呈人传人传播模式，据流行病学调查显示，本起疫情至少传播6代。病例年龄范围为2~80岁，其中≥60岁占27.03%（20/74）。职业分布中以工人占55.41%（41/74）和家务/待业占27.03%（20/74）为主，疫情局限，未发生病例外溢。病例间流行病学关联明确，传播链清晰。基因测序结果证实为新冠病毒Delta变异株，与浙江省外输入关联疫情高度同源。结论 本起疫情为一起浙江省外输入COVID-19确诊病例引起的本土聚集性疫情，通过生活、工作接触导致社区传播扩散。 |
| English Abstract: |
| Objective To understand the epidemiological characteristics of a local clustered epidemic caused by 2019-nCoV Delta variant in Ningbo and provide reference for the improvement of COVID-19 epidemic prevention and control.Methods Case finding was conducted based on case definitions,and field epidemiological investigation of COVID-19 cases was carried out.In which Nasal and oropharyngeal swabs of the cases were collected for pathogen testing,and the results were analyzed with descriptive epidemiological methods.Results A total of 74 COVID-19 cases were reported in this epidemic,and the cases were mainly mild ones,accounting for 87.84%(65/74),and there were no severe or critical cases.The epidemic curve showed a human-to-human transmission mode,indicating that a transmission for at least six generations had occurred.The age of the COVID-19 patients ranged from 2 years to 80 years,and 27.03%(20/74) of the cases were older than 60 years.The cases were mainly workers (55.41%,41/74) and housework/the unemployed (27.03%,20/74).The COVID-19 epidemic was limited,and no further spread to other areas occurred.The transmission chain among the cases was clear,and the gene sequencing results confirmed that the current epidemic was caused by 2019-nCoV Delta variant,which was highly homologous to the strains from other province.Conclusion The local COVID-19 epidemic in Ningbo was caused by imported cases of COVID-19 from other province,and local community spread occurred through daily contacts between cases and contacts. |
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