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Properly fitted multilayer masks block 84 per cent of particles expelled by a person wearing it, while two people donning these types of masks can reduce transmission by close to 96 per cent, according to a new study. While wearing a face mask can protect people from COVID-19, scientists, including those from Georgia Institute of Technology in the US, said the type of material, tightness of fit, and the number of fabric layers used can significantly affect exposure risk to the novel coronavirus. The study, published in the journal Aerosol Science and Technology, measured the filtration efficiency of ultrasmall submicron particles passing through a variety of different materials.

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