四川省新型冠状病毒肺炎无症状感染者传染性分析  

Analysis of Infectivity of Asymptomatic Carriers of COVID-19 in Sichuan Province

作　　者：李敏 袁珩[2] 曹一鸥[2] 黄婷[2] 廖雪春[2] 黄小梅 文桂欢 王小娟 毛素玲[2] LI Min;YUAN Heng;CAO Yiou;HUANG Ting;LIAO Xuechun;HUANG Xiaomei;WEN Guihuan;WANG Xiaojuan;MAO Suling(Jianyang Center for Disease Control and Prevention,Chengdu 641400,Sichuan Province,China;Sichuan Center for Disease Control and Prevention,Chengdu 610041,Sichuan Province,China;Sichuan Field Epidemiology Training Program,Chengdu 610041,Sichuan Province,China)

机构地区：[1]四川省现场流行病学培训项目班,成都610041 [2]四川省疾病预防控制中心,成都610041 [3]简阳市疾病预防控制中心,成都641400

出　　处：《预防医学情报杂志》2021年第2期161-164,共4页Journal of Preventive Medicine Information

基　　金：四川省应对新型冠状病毒科技攻关应急项目(项目编号:2020YFS0015)。

摘　　要：目的分析四川省新型冠状病毒肺炎无症状感染者的传染性。方法通过中国疾病预防控制信息系统和各级疾病预防控制中心流行病学调查资料,分析截止2020-03-20四川省本地首代为新型冠状病毒肺炎无症状感染者的传播链情况。结果四川省91例无症状感染者(12例为境外输入)中有3例发生本地传播,共产生3例二代病例,无三代病例发生;3起传播链中,3例首代无症状感染者均有湖北停留史或武汉旅居史,2起通过在家庭生活传播,1起通过多次家庭聚餐传播;3例首代无症状感染者密切接触者共91人,其中3人核酸检测阳性,与首代接触频率均为经常密切接触;3例首代无症状感染者核酸阳性持续时间最短15 d,最长35 d。结论新冠肺炎无症状感染者具有传染性,但传播力有限;长时间、高频次接触可能增加无症状感染者发生传播的风险;无症状感染者可能长时间携带病毒,但数据有限,需持续观察。Objective Analysis of infectivity of asymptomatic carriers of COVID-19 in Sichuan province.Methods Based on the Chinese CDC information system and epidemiological survey data of CDCs at all levels,the data of local transmission chain of the first-generation cases which was asymptomatic carrier was collated and analysed.Results Local transmission occurred in 3 of the 91 asymptomatic carriers in Sichuan province(12 cases were overseas imported cases),and it was resulted in a total of 3 secondgeneration cases and no third-generation cases occurred;among the 3 transmission chains,the first-generation were asymptomatic carriers.they had staying history in Hubei or Wuhan,the 2 transmission chains were transmitted through family contact,the 1 transmission chain was transmitted through multiple family meals;the 3 cases of firstgeneration asymptomatic carriers were in close contact with 91 people,three of them were positive for nucleic acid tests,they were frequency close contacted with the first generation carriers;the duration of nucleic acid positivity in the three cases of the first-generation asymptomatic carriers was 15 days the shortest and 35 days the longest.Conclusions Asymptomatic carriers with COVID-19 are contagious,but their transmission is limited;long-term,high-frequency exposure may increase the risk of transmission for asymptomatic carriers;asymptomatic carriers may carry the virus for a long time,but data are limited and require continuous observation.

关 键 词：新型冠状病毒肺炎 无症状感染者 传染性 

分 类 号：R181[医药卫生—流行病学]