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

Face masks effectively limit the probability of #SARSCoV2 transmission. Masks are particularly effective in combination with other preventive measures against #COVID19 like #ventilation & #SocialDistancing.


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 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 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.

Read more at:

https://science.sciencemag.org/content/early/2021/05/19/science.abg6296






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