中国内地境外输入新型冠状病毒肺炎确诊病例流行病学特征分析

Epidemiological characteristics of imported COVID-19 cases from abroad in China's Mainland

目的分析中国内地境外输入新型冠状病毒肺炎确诊病例的流行病学特征,为进一步评估境外输入风险和防控工作提供依据。方法根据国家及各省市卫生健康委员会公布的确诊病例活动轨迹建立境外输入确诊病例数据库;对确诊病例的三间分布进行流行病学特征分析。结果境外输入病例在各地级市的时间及空间分布均表现出一定的区域性,截至5月20日中国内地有9个地级市境外输入病例超过50例。输入国主要为俄罗斯、英国、美国、法国及西班牙。输入病例中留学生及外籍人员分别占40%、10%。结论境外输入疫情时空表现存在明显差异,且与各地市自身特点及管控政策辐射有关;相关政策对境外输入疫情的调控效果显而易见。

Objective To analyze epidemiological characteristics of imported coronavirus disease 2019(COVID-19)cases from abroad in China's Mainland for providing evidences to estimate and control importation risk of the disease.Methods From official reports issued by China national/provincial/municipal health commissions,we extracted the data on all imported COVID-19 cases from foreign countries and their travel routes from February 29,2020 to May 20,2020.Demographic characteristics and spatial-temporal distribution of the cases were described statistically using SPSS 25.0 and Joinpoint Version 4.7.Results During the period,totally 1709 imported COVID-19 cases were registered in China's Mainland;obviously regional disparities were observed in the spatial-temporal distribution of the imported cases and there were9 municipalities with the number of the imported cases of more than 50.The majority of the imported COVID-19 cases were from countries including Russia,United Kingdom,United States,France,and Spain and of all the imported cases,about 40%were overseas students and only 10%were foreigners.Conclusion The spatial-temporal distribution of imported COVID-19 cases in China's Mainland varied obviously from February to May,2020 and the variation was related to the deployment and implemenntation of the disease control strategies in different cities.