天津市境外输入性新型冠状病毒感染者流行病学特征分析

目的 描述天津市境外输入性新型冠状病毒感染者流行病学特征，为境外输入疫情防控、人员风险评估提供参考。方法 输入性感染者信息来源于中国疾病预防控制信息系统传染病报告信息管理系统，收集2020年3月15日至2021年8月31日由天津市航空口岸入境的疫情输入信息，及各级疾病预防控制中心流行病学报告，采用Excel 2010、SPSS 25.0和R软件进行整理与统计学分析。结果 2020年3月15日至2021年8月31日，天津市累计报告境外输入性新型冠状病毒感染者606例，纳入分析552例，男女性别比例1.8：1，年龄3~77岁，以20~39岁为主（59.8%）。14 d内国际旅居史涉及欧洲地区（43.8%，242例）、非洲地区（25.2%，139例）、美洲地区（15.4%，85例）、亚洲地区（15.6%，86例）。秋、冬季确诊病例占比较高。观察期内，海关入境检疫排查发现感染者比例逐渐下降，个人健康申报、医学隔离监测比例升高。输入性感染者自入境至确诊的时间间隔有延长趋势。结论 天津市航空口岸入境的输入性新型冠状病毒感染者入境首日被发现的比例下降，排查发现感染者的时间间隔有延长趋势，值得警惕和关注。

Epidemiological characteristics of imported COVID-19 cases in Tianjin

Objective To understand the epidemiological characteristics of imported COVID-19 cases in Tianjin, and provide references for risk assessment and control of imported COVID-19 cases. Methods The information of imported COVID-19 cases were obtained from National Notifiable Disease Report System of China CDC. The data of imported COVID-19 cases reported from Tianjin airport and epidemiological surveys by CDCs at all levels from March 15, 2020 to August 31, 2021 were collected and analyzed by using software Excel 2010, SPSS 25.0 and R.Results From March 15, 2020 to August 31, 2021, a total of 606 imported cases of COVID-19 were reported in Tianjin, in which 552 cases were finally included in the analysis. The male to female ratio of the cases was 1.8:1, the age of the cases ranged from 3 to 77 years, and the cases were mainly reported in age group 20-39 years (59.8%). The areas where the imported case sojourned within 14 days included Europe (242 cases, 43.8%), Africa (139 cases, 25.2%), Americas (85 cases, 15.4%) and Asia (86 cases, 15.6%). The proportion of confirmed cases in autumn and winter was relatively high. During the study period, the proportion of infected persons found in custom entry quarantine decreased, and the proportion of persons with personal health declaration and under medical isolation observation increased. The interval between entry and diagnosis of infected persons tended to increase. Conclusion The proportion of imported COVID-19 cases detected on the first day of entry at Tianjin airport decreased, and the interval to detect the infected persons trended to increase, to which close attention must be paid.