Indoor transmission of SARS-CoV-2

doi:10.1111/ina.12766

. 2021 May;31(3):639-645.

doi: 10.1111/ina.12766. Epub 2020 Nov 20.

Indoor transmission of SARS-CoV-2

Hua Qian¹, Te Miao², Li Liu³, Xiaohong Zheng¹, Danting Luo¹, Yuguo Li^{2

4}

Affiliations

¹ School of Energy and Environment, Southeast University, Nanjing, China.
² Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, China.
³ School of Architecture, Tsinghua University, Beijing, China.
⁴ School of Public Health, The University of Hong Kong, Hong Kong, China.

PMID: 33131151
DOI: 10.1111/ina.12766

Indoor transmission of SARS-CoV-2

Hua Qian et al. Indoor Air. 2021 May.

. 2021 May;31(3):639-645.

doi: 10.1111/ina.12766. Epub 2020 Nov 20.

Authors

Hua Qian¹, Te Miao², Li Liu³, Xiaohong Zheng¹, Danting Luo¹, Yuguo Li^{2

4}

Affiliations

¹ School of Energy and Environment, Southeast University, Nanjing, China.
² Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, China.
³ School of Architecture, Tsinghua University, Beijing, China.
⁴ School of Public Health, The University of Hong Kong, Hong Kong, China.

PMID: 33131151
DOI: 10.1111/ina.12766

Abstract

It is essential to understand where and how severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is transmitted. Case reports were extracted from the local Municipal Health Commissions of 320 prefectural municipalities in China (not including Hubei Province). We identified all outbreaks involving three or more cases and reviewed the major characteristics of the enclosed spaces in which the outbreaks were reported and their associated indoor environmental aspects. Three hundred and eighteen outbreaks with three or more cases were identified, comprising a total of 1245 confirmed cases in 120 prefectural cities. Among the identified outbreaks, 53.8% involved three cases, 26.4% involved four cases, and only 1.6% involved ten or more cases. Home-based outbreaks were the dominant category (254 of 318 outbreaks; 79.9%), followed by transport-based outbreaks (108; 34.0%), and many outbreaks occurred in more than one category of venue. All identified outbreaks of three or more cases occurred in indoor environments, which confirm that sharing indoor spaces with one or more infected persons is a major SARS-CoV-2 infection risk.

Keywords: COVID-19; SARS-CoV-2; crowding; indoor environments; indoor hygiene; outbreak.

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[1] WHO, 2020a. Coronavirus disease (COVID-2019) situation reports. Situation report - 162 by June 20, 2020. https://www.who.int/emergencies/diseases/novel-coronavirus-2019/situatio.... Accessed on 1 July 2020.

[2] WHO, 2020a. Coronavirus disease (COVID-2019) situation reports. Situation report - 162 by June 20, 2020. https://www.who.int/emergencies/diseases/novel-coronavirus-2019/situatio.... Accessed on 1 July 2020.

[3] NCPERET (The Novel Coronavirus Pneumonia Emergency Response Epidemiology Team). The epidemiological characteristics of an outbreak of 2019 Novel Coronavirus Diseases (COVID-19) - China, 2020. China CDC Weekly, 2020. Vol. 2 No. x.

[4] NCPERET (The Novel Coronavirus Pneumonia Emergency Response Epidemiology Team). The epidemiological characteristics of an outbreak of 2019 Novel Coronavirus Diseases (COVID-19) - China, 2020. China CDC Weekly, 2020. Vol. 2 No. x.

[5] WHO, 2020b. Coronavirus Disease (COVID-2019) situation reports. Situation report - 22 by Feb 11, 2020. https://www.who.int/docs/default-source/coronaviruse/situation-reports/2.... Accessed on 17 March 2020.

[6] WHO, 2020b. Coronavirus Disease (COVID-2019) situation reports. Situation report - 22 by Feb 11, 2020. https://www.who.int/docs/default-source/coronaviruse/situation-reports/2.... Accessed on 17 March 2020.

[7] China NHC (National Health Commission of the People’s Republic of China), 2020. Transcript of press conference on 11 February 2020. http://www.nhc.gov.cn/xcs/s3574/202002/53900c60791041e09070bca8f40f93ac....

[8] China NHC (National Health Commission of the People’s Republic of China), 2020. Transcript of press conference on 11 February 2020. http://www.nhc.gov.cn/xcs/s3574/202002/53900c60791041e09070bca8f40f93ac....

[9] Wu WS, Li YG, Wei ZF, et al. Investigation and analysis on characteristics of a cluster of COVID-19 associated with exposure in a department store in Tianjin. Chin J Epidemiol. 2020;41(4):489-493.

[10] Wu WS, Li YG, Wei ZF, et al. Investigation and analysis on characteristics of a cluster of COVID-19 associated with exposure in a department store in Tianjin. Chin J Epidemiol. 2020;41(4):489-493.

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Indoor transmission of SARS-CoV-2

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Indoor transmission of SARS-CoV-2

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