Spatiotemporal droplet dispersion measurements demonstrate face masks reduce risks from singing: results from the COvid aNd FacEmaSkS Study (CONFESS)
Spatiotemporal droplet dispersion measurements demonstrate face masks reduce risks from singing: results from the COvid aNd FacEmaSkS Study (CONFESS)
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时空液滴分散测量表明口罩可降低唱歌风险：COvid 和 FacEmaSkS 研究 (CONFESS) 的结果
DOI：
10.1101/2021.07.09.21260247
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Ho K
中科院分区：
文献类型：
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作者：
Ho K
背景COVID-19限制了公共崇拜中的歌唱。我们试图了解液滴传输的变化和戴口罩的影响。MethodsUsing快速激光平面成像，我们测量液滴，而参与者呼气，说“你好”或“蛇”，唱一个音符或“快乐的一天”，有和没有外科口罩。我们测量了平均速度幅值（MVM），时间平均液滴数（TADN）和最大液滴数（MDN）。结果20名受试者的说话声强为71分贝（dB），唱歌声强为85分贝（p<0.001）。所有任务的MVM相似，声音任务或人之间没有明确的层次，戴口罩减少>85%。液滴传输变化很大，特别是唱歌。戴口罩后，唱歌的TADN降低了99%（p<0.001），MDN降低了98%（p<0.001），其他任务降低了86-97%。面具减少了高达48%的差异。戴口罩时，既不唱歌任务传输更多的液滴比呼气。戴上口罩后，这种情况明显减少。在宗教崇拜中戴着面具唱歌似乎和呼气或说话一样安全。这对2019冠状病毒病大流行期间的英国公共卫生指南产生了影响。
BackgroundCOVID-19 has restricted singing in communal worship. We sought to understand variations in droplet transmission and the impact of wearing face masks.MethodsUsing rapid laser planar imaging, we measured droplets while participants exhaled, said ‘hello’ or ‘snake’, sang a note or ‘Happy Birthday’, with and without surgical face masks. We measured mean velocity magnitude (MVM), time averaged droplet number (TADN) and maximum droplet number (MDN). Multilevel regression models were used.ResultsIn 20 participants, sound intensity was 71 Decibels (dB) for speaking and 85 dB for singing (p<0.001). MVM was similar for all tasks with no clear hierarchy between vocal tasks or people and >85% reduction wearing face masks. Droplet transmission varied widely, particularly for singing. Masks decreased TADN by 99% (p<0.001) and MDN by 98% (p<0.001) for singing and 86-97% for other tasks. Masks reduced variance by up to 48%. When wearing a mask, neither singing task transmitted more droplets than exhaling.ConclusionsWide variation exists for droplet production. This significantly reduced when wearing face masks. Singing during religious worship wearing a face mask appears as safe as exhaling or talking. This has implications for UK public health guidance during the COVID-19 pandemic.