This article analyses the configuration of social ties in the context of the pandemic of covid-19 in relation to two contexts of observation and empirical inquiry: on the one hand, Chinese children living in China and, on the other, the descendants of Chinese migrants living in France.
Objective To estimate the effect of airline travel restrictions on the risk of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) importation. Methods We extracted passenger volume data for the entire global airline network, as well as the dates of the implementation of travel restrictions and the observation of the first case of coronavirus disease (COVID-19) in each country or territory, from publicly available sources. We calculated effective distance between every airport and the city of Wuhan, China.
An asymptomatic person infected with severe acute respiratory syndrome coronavirus 2 returned to Heilongjiang Province, China, after international travel. The traveler's neighbor became infected and generated a cluster of ≥71 cases, including cases in 2 hospitals. Genome sequences of the virus were distinct from viral genomes previously circulating in China. © 2020 Centers for Disease Control and Prevention (CDC). All rights reserved.
Currently, the local transmission of coronavirus disease 2019 (COVID-19) has been effectively contained in China; however, the epidemic situation of this highly infectious disease is more and more serious outside of China. Importation of COVID-19 cases from other countries and territories is therefore becoming a new challenge for the control of COVID-19 in China. Malaria was once widely epidemic in China.
Objective To summarize the clinical features and imaging findings of six coronavirus disease 2019 (COVID-19) patients, so as to provide evidences for early diagnosis and clinical intervention. Methods Six COVID-19 patients with positive severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) were enrolled from the Seventh People's Hospital of Shanghai University of Traditional Chinese Medicine from Jan. 1 to Feb. 22, 2020. The epidemiological history, clinical manifestations, imaging data and laboratory indicators were retrospectively analyzed.
目的： 评估湖北新型冠状病毒肺炎的疫情输出风险及其他各省从湖北输入疫情的风险。 方法： 获取截至2020年2月14日我国各省报告病例数（不含临床诊断病例；不含中国香港、澳门和台湾数据）和百度迁徙指数，对各省累计报告病例数和湖北迁出指数进行相关分析，评估湖北疫情输出风险和其他省疫情输入风险。 结果： 全国累计报告确诊病例49 970例，其中湖北37 884例。湖北平均每天迁出至其他省的指数为312.09，武汉和湖北其他市分别为117.95和194.16。各省累计报告病例数与湖北、武汉及湖北其他市迁出至各省的人口迁徙指数均成正相关，相关系数分别为0.84、0.84和0.81；湖北、武汉及湖北其他市人口迁出分别可解释线性模型71.2%、70.1%和66.3%的变异。湖北高输出风险时间集中在1月27日前，其中1月23日前的疫情输出风险主要来源于武汉，之后主要来源于湖北其他市。疫情输入风险排前3位的是湖南、河南和广东，累计风险指数分别为58.61，54.75和49.62。 结论： 我国各省疫情主要由湖北输入引起，湖北限制人口流出、各省加强对湖北省迁入人员的检疫，可以较大程度降低各省（除湖北）疫情持续传播风险。
In this paper, a simple susceptible-infected (SI) model is build for simulating the early phase of COVID-19 transmission process. By using the data collected from the newest epidemiological investigation, the parameters of SI model is estimated and compared with those from some other studies. The population migration data during Spring festival in China are collected from Baidu.
Objective To assess the imported risk of COVID-19 in Guangdong province and its cities, and conduct early warning. Methods Data of reported COVID-19 cases and Baidu Migration Index of 21 cities in Guangdong province and other provinces of China as of February 25, 2020 were collected. The imported risk index of each city in Guangdong province were calculated, and then correlation analysis was performed between reported cases and the imported risk index to identify lag time. Finally, we classified the early wanning levels of epidemic by imported risk index.
Objective: To analyze the regional epidemic features of Coronavirus disease 2019 (COVID-19) in Henan Province, China. Methods: According to the data of COVID-19 patients and the resident population at the end of 2018 in Henan Province, statistical description and analysis of epidemiological characteristics of COVID-19 in Henan Province were conducted, including the time distribution, population distribution, and regional distribution. Results: The cumulative incidence of COVID-19 in Henan Province was 1.32/100 000, the cure rate was 98.03%, and the fatality rate was 1.73% by March 9, 2020.
In this paper, we provide a statistical analysis of population movements leaving Wuhan based on mass population movement information which is collected by geographic services of Tencent and Baidu. Firstly, we find that the five million people leaving Wuhan before the official announcement that they will close the exits are not much different from the normal population movement during the previous Spring Festival travel rush. However, small portion of the population poured out of Wuhan in the last period before the exits closed.
