Liu C, Liu C H, Chen L, Liang X M, Wu J, Peng C, Shi H, Huang L T
Guangzhou Forensic Science Institute, Guangzhou 510030, China.
School of Forensic Medicine, Southern Medical University, Guangzhou 510515, China.
Fa Yi Xue Za Zhi. 2021 Aug;37(4):527-532. doi: 10.12116/j.issn.1004-5619.2021.410704.
Abstract： Objective To analyze the first epidemic spread of the novel coronavirus Delta variant in China based on public security forensic perspective, investigate its transmission characteristics, contributing factors, and epidemiologic research experience, and provide a reference for the prevention and control of the epidemic caused by the novel coronavirus variant. Methods Based on the information that public security forensic experts obtained from front-line epidemiologic research, the gender, age, place of residence, transmission route and infectivity of the coronavirus disease 2019 （COVID-19） confirmed cases, asymptomatic infected persons and their close contacts in Guangzhou caused by the novel coronavirus Delta variant were analyzed. The basic reproduction number （） during this epidemic in Guangzhou was calculated. Results Among the 153 cases infected with novel coronavirus Delta variant in the epidemic, 63 cases were male and 90 cases were female, their age ranging from 1 to 92 years, with a median age of 49 years. The main route of transmission was close contact, including dining together, co-living, and close contact in the same residential building. There were 31 cases of family clusters, 25 of which were in Liwan District. The epidemic lasted from May 26 to May 29, and the remained above 4.0. After May 30, began to decline and remained below 1.0 from June 7. Conclusion The novel coronavirus Delta variant is highly infectious, the crowd is generally susceptible to infection and family cluster cases are easy to occur. So, it is necessary to precisely prevent and control this strain. Public security forensic experts have both medical literacy and criminal investigation capabilities, they can play a more professional role in epidemic prevention and control.
目的 从公安法医角度分析新型冠状病毒Delta变异株在我国的首次疫情传播情况，探究其传播特征、影响因素及流行病学研究经验，为新型冠状病毒变异株所致疫情的防控提供参考。方法 基于公安法医专家从一线流行病学研究获取的信息，分析新型冠状病毒Delta变异株引起的广州市新型冠状病毒肺炎（COVID-19）确诊病例、无症状感染者及其密切接触者的性别、年龄、居住地、传播途径及传染性。计算广州此次疫情期间的基本再生数（ ）。结果 本次疫情中153例感染新型冠状病毒Delta变异株的病例，男性63例，女性90例，年龄1～92岁，中位年龄49岁。主要传播途径为密切接触，包括共同就餐、共同居住及同一住宅楼内密切接触。有31起家庭聚集性病例，其中25起在荔湾区。疫情持续时间为5月26日至5月29日， 一直高于4.0。5月30日后， 开始下降，6月7日起一直低于1.0。结论 新型冠状病毒Delta变异株传染性强，人群普遍易感且易发生家庭聚集性病例，需精准防控该毒株。公安法医专家兼具医学素养和刑侦能力，在疫情防控中能发挥更专业的作用。
