Li H, Wang W R, Fan B X, Liu X F, Jiang X L, Tian Y F, Xi R Y, Bai F L, Chi S M, Yang Shengmei
Institute for Communicable Disease Prevention and Control, Inner Mongolia Autonomous Region Center for Disease Control and Prevention, Hohhot 010031, China.
Emergency Response Office, Inner Mongolia Autonomous Region Center for Disease Control and Prevention, Hohhot 010031, China.
Zhonghua Liu Xing Bing Xue Za Zhi. 2022 Feb 10;43(2):189-194. doi: 10.3760/cma.j.cn112338-20211118-00899.
To understand the epidemiological characteristics of COVID-19 epidemic in Ejina banner, Inner Mongolia, in October 2021 and provide evidence for the improvement of COVID-19 prevention and control. The information about the time, area and population distributions of COVID-19 cases in Ejina before November 13, 2021 and the gene sequencing result of the isolates were collected for a statistical descriptive analysis. The first COVID-19 case in Ejina occurred on 7 October, 2021. A total of 164 COVID-19 cases were reported from October 19 to November 12. Most cases were distributed in 6 communities in Darahub (156 cases, 95.12%). The result of full gene sequencing of the isolates indicted that the pathogen was Delta variant (B.1.617.2). The male to female ratio of the cases was 1.3∶1. The age of cases ranged from 1 to 85 years, and the cases aged 20-59 years accounted for 78.66%. The main clinical symptoms were sore throat (91 cases, 91.92%), cough (49 cases, 49.49%) and fever (23 cases, 23.23%). Most cases were ordinary ones (81 cases, 49.39%) and mild ones (68 cases, 41.46%). The cases were mainly detected at the isolation points (84 cases, 51.22%) and through population based nucleic acid testing (62 cases, 37.80%). The basic reproduction number () of COVID-19 was 5.3, the average incubation period was 3.9 days. The local government rapidly started Ⅳ level emergency response and conducted 10 rounds of nucleic acid tests. The transferring of travelers reduced the risk for the further spread of COVID-19 in Ejina. The epidemic of COVID-19 in Ejina characterized by strong transmission, short incubation period, herd susceptibility and case clustering. Delta variant (B.1.617.2) was the pathogen, which might be imported from Zeke port. Comprehensive prevention and control measures, such as closed-loop management and vaccination, should be continued. The successful transferring of the patients and travelers provided evidence for the effective and precise prevention and control of COVID-19 in a routine manner.
为了解2021年10月内蒙古自治区额济纳旗新冠肺炎疫情的流行病学特征，为完善新冠肺炎疫情防控工作提供依据。收集额济纳旗2021年11月13日前新冠肺炎病例的时间、地区和人群分布信息以及毒株基因测序结果进行统计描述性分析。额济纳旗首例新冠肺炎病例于2021年10月7日出现。10月19日至11月12日共报告164例新冠肺炎病例。多数病例分布在达来呼布镇6个社区（156例，占95.12%）。毒株全基因测序结果表明病原体为德尔塔变异株（B.1.617.2）。病例男女比例为1.3∶1。病例年龄范围为1至85岁，20至59岁病例占78.66%。主要临床症状为咽痛（91例，占91.92%）、咳嗽（49例，占49.49%）和发热（23例，占23.23%）。多数病例为普通型（81例，占49.39%）和轻型（68例，占41.46%）。病例主要在隔离点检出（84例，占51.22%）和通过全员核酸检测发现（62例，占37.80%）。新冠肺炎基本再生数（ ）为5.3，平均潜伏期为3.9天。当地政府迅速启动Ⅳ级应急响应并开展了10轮核酸检测。转运涉疫人员降低了新冠肺炎在额济纳旗进一步传播的风险。额济纳旗新冠肺炎疫情具有传播力强、潜伏期短、人群易感性和病例聚集性等特点。德尔塔变异株（B.1.617.2）为病原体，可能自策克口岸输入。应继续落实闭环管理、疫苗接种等综合防控措施。患者和涉疫人员的成功转运为常态化精准防控新冠肺炎疫情提供了经验。
