The airborne lifetime of small speech droplets and their potential importance in SARS-CoV-2 transmission
The airborne lifetime of small speech droplets and their potential importance in SARS-CoV-2 transmission
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DOI：
10.1073/pnas.2006874117
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发表时间：
2020-06-02
影响因子：
11.1
通讯作者：
Anfinrud, Philip
中科院分区：
文献类型：
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作者：
Stadnytskyi, Valentyn;Bax, Christina E.;Anfinrud, Philip
由严重急性呼吸综合征冠状病毒2型（SARS-CoV-2）无症状携带者产生的语音飞沫越来越被认为是一种可能的疾病传播方式。高灵敏度的激光散射观测显示，大声说话每秒可以发出数千个口腔液滴。在一个封闭的，停滞的空气环境中，他们从窗口的视图中消失的时间常数在8至14分钟的范围内，这对应于约的液滴核。4 μ m直径或12- 21 μ m液滴。这些观察结果证实，在密闭环境中，正常说话很可能会导致空气传播病毒。
Speech droplets generated by asymptomatic carriers of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) are increasingly considered to be a likely mode of disease transmission. Highly sensitive laser light scattering observations have revealed that loud speech can emit thousands of oral fluid droplets per second. In a closed, stagnant air environment, they disappear from the window of view with time constants in the range of 8 to 14 min, which corresponds to droplet nuclei of ca. 4 mu m diameter, or 12- to 21-mu m droplets prior to dehydration. These observations confirm that there is a substantial probability that normal speaking causes airborne virus transmission in confined environments.