文章摘要
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].中华流行病学杂志,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
收稿日期:2022-02-14  出版日期:2022-09-09
DOI:10.3760/cma.j.cn112338-20220214-00119
中文关键词: 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
英文关键词: COVID-19;2019-nCoV;Delta variant;Cluster epidemic;Epidemiological characteristic
基金项目: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)
作者单位E-mail
张栋梁 宁波市疾病预防控制中心传染病防制所, 宁波 315010  
陈奕 宁波市疾病预防控制中心传染病防制所, 宁波 315010  
易波 宁波市疾病预防控制中心传染病防制所, 宁波 315010  
王爱红 宁波市疾病预防控制中心传染病防制所, 宁波 315010  
马晓 宁波市疾病预防控制中心传染病防制所, 宁波 315010  
褚衍茹 宁波市疾病预防控制中心传染病防制所, 宁波 315010  
雷松 宁波市疾病预防控制中心传染病防制所, 宁波 315010  
张言武 宁波市疾病预防控制中心传染病防制所, 宁波 315010  
李梦颖 宁波市疾病预防控制中心传染病防制所, 宁波 315010  
许国章 宁波市疾病预防控制中心传染病防制所, 宁波 315010 xugz@nbcdc.org.cn 
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中文摘要:
      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。
英文摘要:
      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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