期刊
JOURNAL OF INFECTION
卷 83, 期 1, 页码 92-95出版社
W B SAUNDERS CO LTD
DOI: 10.1016/j.jinf.2021.04.019
关键词
COVID-19; SARS-CoV-2; Face masks; Transmission; Epidemiology; Public health
资金
- Health and Medical Research Fund, Food and Health Bureau, Government of the Hong Kong Special Administrative Region [COVID190118]
- Research Grants Council of the Hong Kong SAR Government [T11-712/19-N]
The study found that although universal mask-wearing can reduce the transmission of COVID-19 in Hong Kong, 77.6% of transmission events occurred in household and social settings where masks are not usually worn. Infections in mask-on settings were more likely to be asymptomatic.
Objectives: mask-wearing outside the home has been almost universal in Hong Kong since late January 2020 with very high compliance. Nevertheless, community spread of COVID-19 has still occurred. We aimed to assess the settings where COVID-19 transmission occurred and determine the fraction of transmission events that occurred in settings where masks are not usually worn. Methods: we reviewed detailed information provided by the Hong Kong Department of Health on local COVID-19 cases diagnosed up to 30 September 2020 to determine the most likely settings in which transmission occurred. We classified them in probably mask-on or mask-of and compared the prevalence of asymptomatic infections in these settings. Results: among the 2425 cases (65.3%, 2425/3711) with information on transmission setting, 77.6% of the transmission occurred in household and social settings where face masks are not usually worn. Infections that occurred in mask-on settings were more likely to be asymptomatic (adjusted odds ratio 1.33; 95% confidence interval: 1.04, 1.68). Conclusions: we conclude that universal mask-wearing can reduce transmission, but transmission can continue to occur in settings where face masks are not usually worn. The higher proportion of asymptomatic cases in mask-on settings could be related to a milder disease presentation or earlier case detection. (C) 2021 The British Infection Association. Published by Elsevier Ltd. All rights reserved.
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