标题：丽水市新型冠状病毒肺炎聚集性病例潜伏期传染性分析

      作者：邱理杨 1，季巧英 1，夏永玲 1，叶先明 2，朱海博 3，陈晓蕾 1    1.丽水市疾病预防控制中心，浙江 丽水 323000；2.庆元县疾病预防控制中心，浙江 庆元 323800；3.青田县疾病预防控制中心，浙江 青田 323900

      卷次： 2021年32卷13期

      【摘要】 目的 分析丽水市新型冠状病毒肺炎(COVID-19)聚集性疫情的病例潜伏期传染性，为提高防控能力提供依据。方法 收集丽水市2020年1月20日至2月7日期间COVID-19聚集性病例和密切接触者的流行病学调查资料，分析病例发病前后的密切接触者发病情况。结果 丽水市共报告聚集性疫情两起，发生二代病例6例(其中确诊病例5例，无症状感染者1例)，三代病例1例；在病例发病前2 d接触者占4/7，发病后接触者占1/7，发病前后均有接触占2/7；9例病例的密切接触者共247人，发病前接触143人，发病后接触69人，发病前后均有接触35人，罹患率分别为2.80% (4/143)、1.45% (1/69)、5.71% (2/35)，三组比较差异无统计学意义(P>0.05)。结论 新型冠状病毒肺炎患者发病前2 d就具有传染性，传染性与发病后无明显区别，密切接触者排摸需要包括病例发病前3 d的接触者。
      【关键词】 丽水市；新型冠状病毒肺炎；潜伏期；传染性
      【中图分类号】R511 【文献标识码】 A 【文章编号】 1003—6350（2021）13—1720—03

Analysis on the infectivity of clustered cases of coronavirus disease 2019 during incubation period in Lishui city.QIU Li-yang 1, JI Qiao-ying 1, XIA Yong-ling 1, YE Xian-ming 2, ZHU Hai-bo 3, CHEN Xiao-lei 1.
1. Lishui MunicipalCenter for Disease Control and Prevention, Lishui 323000, Zhejiang, CHINA; 2. Qingyuan County Center for Disease Controland Prevention, Qingyuan 323800, Zhejiang, CHINA; 3. Qingtian County Center for Disease Control and Prevention,Qingtian 323900, Zhejiang, CHINA
【Abstract】 Objective To investigate the infectivity of clustered cases of coronavirus disease 2019 (COV-ID-19) during incubation period in Lishui city. Methods Epidemiological data of clustered cases of COVID-19 andclose contacts were collected, to analyze the incidence of close contacts. Results Two clusters occurred in Lishui, and6 second-generation cases (5 confirmed cases and 1 asymptomatic case) and 1 third-generation case were found. Amongthe clustered cases, 4/7 were exposed 2 d before the patient developed symptoms, 1/7 after the patient developed symp-toms, and 2/7 both before and after. There were 247 close contacts, including 143 close contacts before the patient devel-oped symptoms, 69 after, and 35 both before and after. The attack rates were 2.80% (4/143), 1.45% (1/69), 5.71% (2/35),and there was no statistically significant difference between the three groups (P>0.05). Conclusion COVID-19 caseswere infectious 2 days before onset, and the infectivity was the same as the case who developed symptom. Close contactscreening requires the inclusion of contacts 3 days prior to the onset of the case.
      【Key words】 Lishui city; Coronavirus disease 2019; Incubation; Infectivity·短篇论著·doi:10.3969/j.issn.1003-6350.2021.13.025基金项目：浙江省丽水市科技计划项目(编号：2020KJGG05、2020KJGG06)