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Blue surgical face masks are only 10% effective in preventing COVID infection, new study finds – Daily Mail

Most blue surgical face masks used by many during the pandemic are not enough to avoid people from being infected with COVID-19, an alarming new study has found. 

http://archive.today/2021.08.22-050636/https://www.dailymail.co.uk/news/article-9914969/Popular-blue-surgical-face-masks-NOT-stop-people-infected-COVID-19.html

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Effectiveness of Face Masks in Preventing Airborne Transmission of SARS-CoV-2 – American Society for Microbiology

Airborne simulation experiments showed that cotton masks, surgical masks, and N95 masks provide some protection from the transmission of infective SARS-CoV-2 droplets/aerosols; however, medical masks (surgical masks and even N95 masks) could not completely block the transmission of virus droplets/aerosols even when sealed.

https://msphere.asm.org/content/5/5/e00637-20

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Low-cost measurement of face mask efficacy for filtering expelled droplets during speech – Science Magazine

We noticed that speaking through some masks (particularly the neck gaiter) seemed to disperse the largest droplets into a multitude of smaller droplets (see fig. S5), which explains the apparent increase in droplet count relative to no mask in that case. Considering that smaller particles are airborne longer than large droplets (larger droplets sink faster), the use of such a mask might be counterproductive. Furthermore, the performance of the valved N95 mask is likely affected by the exhalation valve, which opens for strong outwards airflow. While the valve does not compromise the protection of the wearer, it can decrease the protection of persons surrounding the wearer. In comparison, the performance of the fitted, non-valved N95 mask was far superior.

https://web.archive.org/web/20200902201232/https://advances.sciencemag.org/content/6/36/eabd3083