江苏省SARS⁃CoV⁃2 Omicron变异株引起的新型冠状病毒肺炎流行病学特征分析
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E-mail:aaawxm110@163.com;hm6114@126.com

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江苏省重点研发计划(BE2020616);宿迁市指导性科技计划(Z2021011)


Epidemiology of infections with SARS⁃CoV⁃2 Omicron variant in Jiangsu Province,China
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    目的:分析江苏省由新型冠状病毒即严重急性呼吸综合征冠状病毒2型(severe acute respiratory syndrome coronavi- rus 2,SARS-CoV-2)Omicron变异株引起的新型冠状病毒肺炎(coronavirus disease 2019,COVID-19)的流行病学特征,为后续疫情的防控措施提供数据支持。方法:收集江苏省卫生健康委员会官网以及各市政府官方通报(2022年2月13日—4月9日)的 COVID-19病例数据并进行流行病学调查研究。结果:截至2022年4月9日,江苏省SARS-CoV-2 Omicron变异株引起的COVID -19疫情蔓延势头初步遏制,累积发病率为0.48/10万,病死率为0。无症状感染者比例高(76.3%),确诊病例中以轻型为主。发病中位年龄为42岁,<20岁感染者占16.9%。OmicronBA.1变异株中位潜伏期为5.0(4.5,6.0)d,BA.2变异株中位潜伏期为3.0(2.8, 3.5)d,两组潜伏期差异有统计学意义(P<0.05)。聚集性病例比例较高(81.6%),主要来自家庭聚集。结论:Omicron变异株传染性强,潜伏期短,毒力减弱,该阶段江苏省Omicron感染病死率为0,江苏省实施的精准防控成果显著。

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    Objective:This study aims to analyze the epidemiological characteristics of coronavirus disease 2019(COVID - 19) caused by severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)Omicron variant and provide data support for prevention and control measures followed. Methods:The COVID-19 data during February 13,2022 to April 9,2022 were obtained from official website of Jiangsu Province Health Commission and municipal governments. Descriptive epidemiological methods were used to analyze the characteristics of cases. Results:As of April 9,2022,the spread of COVID - 19 caused by SARS - CoV - 2 Omicron variant in Jiangsu Province has been initially contained,with a cumulative incidence of 0.48/100 000 and a fatality rate of 0. It was characterized by a high proportion(76.3%)of asymptomatic patients,and most of the confirmed cases were mild. The median age was 42 years,and 16.9% infected individuals were under 20 years old. The median incubation period of Omicron BA.1 variant was 5.0(4.5,6.0)days,and that of BA.2 variant was 3.0(2.8,3.5)days,with significant difference(P<0.05). There was a high proportion of cluster cases(81.6%). Among them,the main type was family cluster. Conclusion:Omicron variant is highly infectious,with short incubation period and weakened virulence. At this stage,the fatality rate of infection caused by Omicron variant in Jiangsu Province was 0. The results of precise epidemic control measures implemented in Jiangsu Province were remarkable.

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何薇,俞飞超,魏艳秋,孙伟,任登华,吴桢珍,冯旰珠,吉宁飞,王新民,黄茂.江苏省SARS⁃CoV⁃2 Omicron变异株引起的新型冠状病毒肺炎流行病学特征分析[J].南京医科大学学报(自然科学版),2022,42(11):1614-1620

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