Efficacy of face masks, neck gaiters and face shields for reducing the expulsion of simulated cough-generated aerosols.
Efficacy of face masks, neck gaiters and face shields for reducing the expulsion of simulated cough-generated aerosols.
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DOI：
10.1080/02786826.2020.1862409
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发表时间：
2021-01-07
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建议戴口罩，以减少SARS-CoV-2的社区传播。口罩和其他覆盖物的主要好处之一是作为源头控制装置，减少咳嗽、呼吸和说话时呼吸道气溶胶的排出。面罩和绑腿被提议作为面罩的替代品，但是关于面罩和绑腿作为传染源控制设备的信息有限。我们使用了一个带有柔韧皮肤头罩的咳嗽气溶胶模拟器，将小气溶胶颗粒（0至7 μm）推进到不同的面罩中。N95口罩阻隔了99%（标准差0.3%）的咳嗽气雾剂，医用级手术口罩阻隔了59%（标准差6.9%），三层棉布口罩阻隔了51%（标准差7.7%），涤纶护颈罩单层阻隔了47%（标准差7.5%），折叠成双层时阻隔了60%（标准差7.2%）。相比之下，面罩阻挡了2% （SD 15.3%）的止咳气雾剂。我们的研究结果表明，口罩和绑腿比面罩更适合作为咳嗽气溶胶的源控制设备。
Face masks are recommended to reduce community transmission of SARS-CoV-2. One of the primary benefits of face masks and other coverings is as source control devices to reduce the expulsion of respiratory aerosols during coughing, breathing, and speaking. Face shields and neck gaiters have been proposed as an alternative to face masks, but information about face shields and neck gaiters as source control devices is limited. We used a cough aerosol simulator with a pliable skin headform to propel small aerosol particles (0 to 7 μm) into different face coverings. An N95 respirator blocked 99% (standard deviation (SD) 0.3%) of the cough aerosol, a medical grade procedure mask blocked 59% (SD 6.9%), a 3-ply cotton cloth face mask blocked 51% (SD 7.7%), and a polyester neck gaiter blocked 47% (SD 7.5%) as a single layer and 60% (SD 7.2%) when folded into a double layer. In contrast, the face shield blocked 2% (SD 15.3%) of the cough aerosol. Our results suggest that face masks and neck gaiters are preferable to face shields as source control devices for cough aerosols.
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