福州市315例境外输入新型冠状病毒肺炎病例流行病学特征

The Epidemiological Features of 315 Cases of Imported COVID-19 in Fuzhou City

目的分析福州市境外输入新型冠状病毒肺炎(COVID-19)病例流行病学特征,为调整COVID-19境外输入疫情防控策略提供科学依据。方法收集2020年3月—2021年9月30日福州市境外输入的COVID-19病例数据,对数据进行整理和统计学分析。结果福州市共报告境外输入病例315例,其中确诊病例95例,无症状感染者220例。确诊病例中,轻型病例9例,普通型病例86例;男∶女=2.28∶1;年龄以21~40岁为主;职业以工人、家务待业和商业服务为主。2020年第11—13周福州境外输入病例疫情为第1个高峰,以确诊病例为主;2020年第25周以后进入常态化流行期,以无症状感染者为主。病例从入境到首次检出阳性时间间隔为0.5(0.5,4)d;确诊病例从入境到出现症状时间间隔为3.5(2,8.75)d;病例从入院到出院时间间隔为17(15,29)d。病例来源地涉及5个大洲29个来源国家或地区,入境后目的地遍布我国28个省、直辖市及自治区。在发现途径方面,入境海关发现198例,集中隔离点日常监测发现106例,居家隔离监测发现10例,主动检测发现1例。结论福州市境外输入COVID-19疫情保持在较低的流行水平,未出现境外输入病例引起本地关联病例的现象,说明福州市现有的疫情防控策略合理有效。

Objective By analyzing the epidemiological characteristics of imported COVID-19 cases in Fuzhou city,it provides scientific basis for adjusting the strategy of preventing and controlling imported COVID-19 outbreaks.Methods The data of imported COVID-19 cases in Fuzhou city from March 2020 to September 30,2021 were collected and analyzed in statistical method.Results A total of 315 cases of imported outside the territory was reported in Fuzhou city,including 95 confirmed cases and 220 asymptomatic infected cases.Among the confirmed cases,there were 9 mild cases and 86 common cases.The male to female sex ratio was 2.28∶1,and the age was mainly 21-40 years old;Occupation was dominated by workers,household and business services.The 11^(th) to 13^(th) week in 2020 was the first peak of import cases in Fuzhou city,dominated by confirmed cases.It was a period of normalised endemicity after week 252020,dominated by asymptomatic infected cases.The time interval was 0.5(0.5,4)d from entry to first detection of positivity.The time interval was 3.5(2,8.75)d from entry to onset of symptoms.And the time interval was 17(15,29)d from admission to discharge.Case origin involved 29 countries or territories on 5 continents,the destinations were located throughout our 28 provinces,municipalities,and autonomous regions.In terms of route of detection,198 cases were detected by entry customs,106 cases were detected by routine monitoring at centralized isolation sites,10 cases were detected by monitoring at home isolation,and 1 case was detected by active detection.Conclusion The epidemic situation of COVID-19 imported from abroad in Fuzhou city remained at a low level,and there was no local related cases caused by imported cases,which indicated that the existing epidemic prevention and control strategy in Fuzhou city were reasonable and effective.