天津市首起引发港口登轮人员感染的境外货轮新冠肺炎聚集疫情流行病学调查

Epidemiological investigation on the first COVID-19 outbreak on an entry cargo ship causing infection of port boarding personnel,Tianjin city

目的分析天津市首起引发新登轮人员感染的入境货轮新冠肺炎聚集疫情,为后续涉港疫情处置工作提供经验。方法对天津市首起引发新登轮人员感染的入境货轮新冠肺炎聚集疫情病例及密切接触者进行流调,描述病例三间分布等流行病学特征,分析传播链。采集调查对象呼吸道标本,采用RT-PCR法进行新型冠状病毒核酸检测。结果本次疫情暴露人数为39人,共报告8例病例,涉及1名新登轮人员。共出现三代病例,平均潜伏期11 d(3~14 d)。货轮在疫情暴发前曾多次停靠境外港口,推测当地引航员登轮领航时引发船员感染。新登轮病例曾居住在指示病例房间,提示暴露于阳性环境可能为其传播途径。结论本起疫情为境外港口工作人员登轮作业时携带病毒引起的聚集疫情。加强对入境船舶及船上作业人员的管理,严格落实上下轮人员疫情管控措施,有助于控制涉港输入性疫情扩散。

Objective To analyze the first COVID-19 cluster of inbound cargo ship which cause a newly boarded persons to be infected in Tianjin city,so as to provide experience for further port epidemic disposal.Methods The epidemiological investigation was conducted on the cases and close contact in the first COVID-19 cluster of inbound cargo ship which cause a newly boarded persons to be infected.The epidemiological characteristics such as the distribution of disease was described,and the transmission chain was found.Respiratory specimens were collected from surveyed subjects and tested for novel coronavirus nucleic acids using RT-PCR.Results The number of people exposed in this outbreak was 39,with 8 cases reported,involving 1 new boarder.There were 3 generations of cases and the mean incubation period was 11 days(3-14 days).Fighters had stopped at foreign ports several times before the outbreak.It was speculated that the local pilot caused the infection while navigating in the pilothouse.The new boarding case used to live in first case’s room,suggesting that exposure to the viral environment may be the way of transmission.Conclusion The source of this outbreak may brought by overseas port workers during their boarding operation.Strengthening attention to inbound ships and operators on ship,and strictly implement epidemic control measures for staff on and off the freighter,will help control the spread of port-related imported epidemics.