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Nat Med:中国万州是如何有效控制SARS-CoV-2病毒传播 ?

2020-12-01 haibei MedSci原创

万州是中国重庆的一个拥有174万人口的城市,与湖北省西部接壤。作为湖北省通往中国西南地区的门户,万州迅速受到COVID-19疫情的影响,其震中是武汉。

万州是中国重庆的一个拥有174万人口的城市,与湖北省西部接壤。作为湖北省通往中国西南地区的门户,万州迅速受到COVID-19疫情的影响,其震中是武汉。

2020年1月下旬春节假期期间,约有2万人从湖北省返回万州。随着2020年1月23日武汉及周边地区的封锁,万州也成为流行病学调查的封闭环境。这些情况为更好地了解COVID-19的致病菌--严重急性呼吸道综合征冠状病毒2(SARS-CoV-2)1的传播动态和危险因素提供了机会。

中国22个省约有47个城市的人口规模与万州相似(150万至250万),并采取了同样的遏制措施来应对COVID-19疫情。此外,万州的人口规模与欧洲和美国的大中型城市相当。这些特点使万州成为受COVID-19疫情严重影响的国家和城市的研究人员和政策制定者更好地了解SARS-CoV-2感染的传播动态和风险因素,以及控制措施的有效性的合适例子。

最近,研究人员在Nature Medicine发文,评估了中国万州2019年冠状病毒病(COVID-19)控制措施的有效性。对整个万州COVID-19疫情期间183例COVID-19确诊病例及其五代传播的密切接触者的流行病学数据进行了分析,这些病例均为重症急性呼吸综合征冠状病毒2型。有症状和无症状的病例分别约占67.2%和32.8%。无症状和症状前传播占记录传播总数的75.9%。G1-G2传播的繁殖数为1.64(95%置信区间:1.16-2.40),随着严格控制措施的实施,后几代的繁殖数下降到0.31-0.39。

感染者感染后5 d内接触、频繁接触和接触时间≥8 h的感染风险大幅提高。通过社会疏散、广泛的接触者追踪、大规模检测和严格的密切接触者隔离等措施,切断传播链,COVID-19在万州的传播得到有效控制。

 

 

原始出处:

Qiuling Shi et al. Effective control of SARS-CoV-2 transmission in Wanzhou, China. Nature Medicine (2020). 

 

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    2021-08-31 hukaixun
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    2021-03-07 liye789132251
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    2020-12-01 Jessie Zhang

    厉害了!通过社会疏散、广泛的接触者追踪、大规模检测和严格的密切接触者隔离等措施,切断传播链,COVID-19在万州的传播得到有效控制!中国速度!

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