Effects of a closed-loop system against SARS-CoV-2 at the Beijing 2022 Olympic Winter Games: a descriptive and modeling study.

IF 2.6 3区医学 Q1 EMERGENCY MEDICINE

World journal of emergency medicine Pub Date : 2023-01-01 DOI:10.5847/wjem.j.1920-8642.2023.105

Rong Xiong, Jieping Zhou, Wenning Li, Jie Liu, Jing Lou, Sijia Tian, Huixin Lian, Shengmei Niu, Luxi Zhang, Wenhang Li, Jinjun Zhang

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引用次数: 0

Abstract

Background: To assess the efficacy of the epidemic prevention measures of the "closed-loop" system adopted by the Beijing 2022 Olympic Winter Games (BOWG).

Methods: We retrospectively collected and analyzed information, including age, sex, nationality, vaccination status, date of diagnosis, and date of entry, from 280 SARS-CoV-2-positive individuals identified during the BOWG. A susceptibility-exposed-infectious-remove model was employed to evaluate the effectiveness of epidemic prevention strategies on controlling the spread of SARS-CoV-2 under different scenarios during the BOWG.

Results: Regarding SARS-CoV-2-positive cases, 97.9% were imported, and 96.4% were asymptomatic. The median age was 37 years (range: 29-47 years), and 73.9% were male, with the majority of cases being broadcasters and European attendees. Regarding vaccination status, 93.5% were fully vaccinated, and six cases were considered to have been infected in the closed-loop system during the BOWG. Assuming that the BOWG adopted a semi-closed-loop management system, the cumulative number of confirmed cases would be 1,137 for quick quarantine measures (3 d later) implemented and 5,530 for delayed quarantine measures (9 d later) implemented. This modeling revealed that stringent pandemic prevention measures and closed-loop management effectively controlled the spread of SARS-CoV-2 during the BOWG.

Conclusion: Imported cases are considered the main risk factor for SARS-CoV-2 transmission during mass gatherings, but a comprehensive closed-loop system could minimize transmission among attendees and general personnel.

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北京2022年冬季奥运会SARS-CoV-2闭环系统的影响:描述性和建模研究

背景:评估北京2022年冬奥会防疫“闭环”措施的效果。方法:回顾性收集并分析了在BOWG期间发现的280例sars - cov -2阳性个体的年龄、性别、国籍、疫苗接种状况、诊断日期和入境日期等信息。采用敏感性-暴露-感染-去除模型，评价了疫情防控策略在BOWG期间不同情景下控制SARS-CoV-2传播的有效性。结果:境外输入病例占97.9%，无症状感染者占96.4%。中位年龄为37岁(范围:29-47岁)，73.9%为男性，大多数病例是广播公司和欧洲与会者。在疫苗接种状况方面，93.5%的人完全接种了疫苗，在BOWG期间被认为是闭环系统感染的6例。假设BOWG采用半闭环管理系统，则实施快速隔离(3天后)的累计确诊人数为1137人，实施延迟隔离(9天后)的累计确诊人数为5530人。该模型显示，严格的大流行预防措施和闭环管理有效地控制了BOWG期间SARS-CoV-2的传播。结论:输入性病例被认为是人群聚集传播的主要危险因素，但综合闭环系统可以最大限度地减少参与者和一般人员之间的传播。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

World journal of emergency medicine EMERGENCY MEDICINE-

CiteScore

2.50

自引率

28.60%

发文量

671

期刊介绍： The journal will cover technical, clinical and bioengineering studies related to multidisciplinary specialties of emergency medicine, such as cardiopulmonary resuscitation, acute injury, out-of-hospital emergency medical service, intensive care, injury and disease prevention, disaster management, healthy policy and ethics, toxicology, and sudden illness, including cardiology, internal medicine, anesthesiology, orthopedics, and trauma care, and more. The journal also features basic science, special reports, case reports, board review questions, and more. Editorials and communications to the editor explore controversial issues and encourage further discussion by physicians dealing with emergency medicine.