陈剑锋, 方利萍, 李永旗. 上海市青浦区一起建筑工地新冠病毒Omicron变异株聚集性疫情流行特征分析[J]. 上海预防医学, 2023, 35(1): 28-34. DOI: 10.19428/j.cnki.sjpm.2023.22501
引用本文: 陈剑锋, 方利萍, 李永旗. 上海市青浦区一起建筑工地新冠病毒Omicron变异株聚集性疫情流行特征分析[J]. 上海预防医学, 2023, 35(1): 28-34. DOI: 10.19428/j.cnki.sjpm.2023.22501
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CHEN Jianfeng, FANG Liping, LI Yongqi. Epidemiological characterization of a cluster of COVID-19 caused by SARS-CoV-2 Omicron variant at a construction site in Qingpu District， Shanghai[J]. Shanghai Journal of Preventive Medicine, 2023, 35(1): 28-34. DOI: 10.19428/j.cnki.sjpm.2023.22501
Citation: CHEN Jianfeng, FANG Liping, LI Yongqi. Epidemiological characterization of a cluster of COVID-19 caused by SARS-CoV-2 Omicron variant at a construction site in Qingpu District， Shanghai[J]. Shanghai Journal of Preventive Medicine, 2023, 35(1): 28-34. DOI: 10.19428/j.cnki.sjpm.2023.22501
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上海市青浦区一起建筑工地新冠病毒Omicron变异株聚集性疫情流行特征分析

Epidemiological characterization of a cluster of COVID-19 caused by SARS-CoV-2 Omicron variant at a construction site in Qingpu District， Shanghai

    摘要
  • 摘要:
    目的 对新冠病毒Omicron变异株引起的建筑工地聚集性疫情的流行特征进行分析，为疫情防控工作提供依据。
    方法 收集上海市青浦区一建筑工地新冠病毒感染者的人口学特征、建筑工地基本情况等信息，采用描述流行病学方法进行分析，应用R软件计算基本再生系数（R0）和实时再生系数（Rt）。
    结果 2022年4月12日—5月8日，该建筑工地累计报告感染者314例，罹患率60.62%；不同性别罹患率差异无统计学意义（χ2=0.358，P=0.550）；工人和管理人员罹患率差异有统计学意义（χ2=10.868，P<0.001）；接种过疫苗与未接种过疫苗者罹患率差异无统计学意义（χ2=2.861，P=0.091）。感染者年龄在5个月~68岁，M（P25，P75）为49.0（39.8，54.0）岁，以男性为主（83.44%）。疫情主要集中在工人宿舍区，各宿舍区各楼栋均有感染者报告，不同楼栋罹患率在33.33%~87.50%。43%的感染者出现临床症状，以咳嗽（33.33%）、发热（30.37%）、头痛（17.04%）为主，不同性别出现临床症状的比例差异无统计学意义（χ2=1.275，P=0.259）。不管是否接种过疫苗，出现临床症状的比例差异无统计学意义（χ2=0.186，P=0.666）。本起建筑工地聚集性疫情R0为6.08（95%CI：4.49~8.02），Rt先下降后上升再下降。
    结论 该起建筑工地聚集性疫情Omicron变异株传染性强、传播速度快、传播隐匿、症状轻，引起感染人数多，建筑工地发生疫情时须更果断采取严格的控制措施。

     

    Abstract:
    Objective To determine the epidemiological characteristics of a cluster of SARS-CoV-2 Omicron variant at a construction site and provide evidence for further COVID-19 prevention and control.
    Methods Demographic data of all COVID-19 cases at a construction site in Qingpu District， Shanghai， and basic information of the construction site were retrospectively collected through filed investigation. Descriptive epidemiology was used for the analysis. Basic reproduction number （R0 ） and time-dependent reproduction number （Rt ） were calculated using R program.
    Results During April 12 and May 8， 2022， a total of 314 cases were reported at the construction site， with an attack rate of 60.62%. The attack rate significantly differed between workers and managers （χ2=10.868， P<0.001）， whereas did not differ statistically by gender （χ2=0.358， P=0.550） or by vaccination status （χ2=2.861， P=0.091）. The age of all cases ranged from 5 months of age to 68 years， with a media age of 49.0 years （interquartile range： 39.8， 54.0）. In all cases， male was predominant （83.44%）. Moreover， the epidemic was mainly concentrated in the workers’ dormitory area， with infected cases identified in all buildings of each dormitory area. The attack rate ranged between 33.33% and 87.50% across the buildings. Symptoms and signs were observed among 43.0% of all cases， of which major clinical manifestations included cough （33.33%）， fever （30.37%） and headache （17.04%）. Clinical manifestations did not differ by gender （χ2=1.275， P=0.259） or by vaccination status （χ2=0.186， P=0.666）. Additionally， R0 was estimated to be 6.08 （95% confidence interval： 4.49‒8.02）. The Rt showed a decline in the beginning， followed by an increase and a re-decline.
    Conclusion The cluster epidemic of COVID-19 caused by Omicron variant at the construction site is highly contagious， spreads rapidly and quietly， causes mild symptoms， which finally resulted in a large number of infected cases. It warrants rapid and strict containment when an epidemic occurs at construction sites.

     

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