Face masks effectively limit the probability of SARS-CoV-2 transmission

doi:10.1126/science.abg6296

GSTDTAP > 气候变化

DOI	10.1126/science.abg6296
	Face masks effectively limit the probability of SARS-CoV-2 transmission
	Yafang Cheng; Nan Ma; Christian Witt; Steffen Rapp; Philipp S. Wild; Meinrat O. Andreae; Ulrich Pöschl; Hang Su
	2021-06-25
发表期刊	Science
出版年	2021
英文摘要	The effectiveness of masks in preventing the transmission of severe acute respiratory syndrome coronavirus 2 has been debated since the beginning of the COVID-19 pandemic. One important question is whether masks are effective despite the forceful expulsion of respiratory matter during coughing and sneezing. Cheng et al. convincingly show that most people live in conditions in which the airborne virus load is low. The probability of infection changes nonlinearly with the amount of respiratory matter to which a person is exposed. If most people in the wider community wear even simple surgical masks, then the probability of an encounter with a virus particle is even further limited. In indoor settings, it is impossible to avoid breathing in air that someone else has exhaled, and in hospital situations where the virus concentration is the highest, even the best-performing masks used without other protective gear such as hazmat suits will not provide adequate protection. Science , abg6296, this issue p. [1439][1] Airborne transmission by droplets and aerosols is important for the spread of viruses. Face masks are a well-established preventive measure, but their effectiveness for mitigating severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) transmission is still under debate. We show that variations in mask efficacy can be explained by different regimes of virus abundance and are related to population-average infection probability and reproduction number. For SARS-CoV-2, the viral load of infectious individuals can vary by orders of magnitude. We find that most environments and contacts are under conditions of low virus abundance (virus-limited), where surgical masks are effective at preventing virus spread. More-advanced masks and other protective equipment are required in potentially virus-rich indoor environments, including medical centers and hospitals. Masks are particularly effective in combination with other preventive measures like ventilation and distancing. [1]: /lookup/doi/10.1126/science.abg6296
领域	气候变化 ; 资源环境
URL	查看原文
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/334144
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Yafang Cheng,Nan Ma,Christian Witt,et al. Face masks effectively limit the probability of SARS-CoV-2 transmission[J]. Science,2021.
APA	Yafang Cheng.,Nan Ma.,Christian Witt.,Steffen Rapp.,Philipp S. Wild.,...&Hang Su.(2021).Face masks effectively limit the probability of SARS-CoV-2 transmission.Science.
MLA	Yafang Cheng,et al."Face masks effectively limit the probability of SARS-CoV-2 transmission".Science (2021).