目的 分析辽宁省境外输入新型冠状病毒肺炎（COVID-19）病例流行特征及防治措施，为防控COVID-19境外输入疫情提供依据。

方法 通过中国疾病预防控制信息系统收集2020年1月29日—7月12日辽宁省境外输入COVID-19病例资料，结合现场流行病学调查报告，对境外输入COVID-19病例的时间、地区、人群分布、输入来源、临床分型、治愈时间等流行特征进行分析并对相关防控措施进行评价。

结果 1月29日辽宁省报告首例境外输入COVID-19病例，截至7月12日累计报告72例，其中确诊病例33例，占45.83 %，无症状感染者39例，占54.17 %。确诊病例中，轻型病例5例，占15.15 %，普通型病例28例，占84.85 %；无重型、危重型、死亡病例报告。全省共9个市有境外输入病例报告，沈阳和大连市报告较多，分别为36例和21例，占50.00 %和29.17 %。病例年龄以14～49岁为主，共54例、占75.00 %；职业以留学生、离退人员和商业服务人员为主，分别为31、10和10例，占43.06 %、13.89 % 和13.89 %。境外输入病例的来源地涉及18个国家，以美国（22.22 %）、俄罗斯联邦（20.83 %）、英国（15.28 %）居多。境外输入病例中，治愈时间最短2.38 d，最长40.64 d；确诊病例治愈时间平均值为（13.53 ± 7.81）d，无症状感染者治愈（无传染性）时间平均值为（13.82 ± 3.27）d。

结论 辽宁省境外输入COVID- 19病例相对年轻，以无症状感染者及普通型居多，无死亡病例；以留学生、商业服务人员为主；主要来自美国、俄罗斯联邦和英国等国家，现有的防控策略合理有效。

Objective To analyze epidemiological characteristics and containment efficiency of imported cases of coronavirus disease 2019 (COVID-19) in Liaoning province and to provide evidences for the prevention and control of imported COVID-19 cases.

Methods From China Information System for Disease Prevention and Control, we collected the data on all reported COVID-19 cases imported from abroad into Liaoning province from January 29 to July 12, 2020. The demographics, spatial temporal distribution, clinical characteristics and treatment outcomes of the cases were analyzed in combination with the results of field surveys on the cases.

Results The first imported COVID-19 case was reported in Liaoning province on January 29, 2020 and till July 12 of the year, a total of 72 cases were reported, including 33 confirmed cases (45.83%) and 39 asymptomatic infected cases (54.17%). The majority (28, 84.85%) of confirmed cases were common cases and only 5 (15.15%) of the cases were mild cases; no severe, critical or fatal case were reported. In the province, there were 9 municipalities with the reported COVID-19 cases imported from aboard and Shenyang and Dalian were the two municipalities with much more number (36 50.00% and 21 29.17%) of the reported cases. Among the reported cases, 54 (75.00%) were at the ages of 14 to 49 years; 31 (43.06 %) were international students; 10 (13.89 %) were engaged in commercial service and another 10 were retirees. The reported cases entered China from 18 counties and 22.22%, 20.83%, and 15.28% were from the United States, the Russian Federation, and the United Kingdom, respectively. For all the cases, the shortest cure time was 2.38 days and the longest was 40.64 day; the mean cure time was 13.53 ± 7.81 days for the confirmed cases, while the mean time of medical treatment or observation was 13.82 ± 3.27 days for the asymptomatic cases.

Conclusion The imported COVID-19 cases from abroad in Liaoning province were mainly asymptomatic or common cases with younger ages and all the them were cured; the cases were mainly international students and business service personnel from the United States, the Russian Federation. The implemented strategies for the containment of the imported COVID-19 cases were reasonable and effective.