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respiratory grade b surgical mask in korea

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Widely used surgical masks put health care workers at risk …

But surgical masks, designed to protect patients from a surgeon’s respiratory droplets, aren’t effective at blocking particles smaller than 100 microns, according to mask maker 3M Corp.

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To mask, or not? How public health officials created culture …

19/5/2020& 0183;& 32;She directed me to a study from 2015 in which researchers tested surgical and cloth masks in clinical settings involving high-risk exposure to respiratory infections in Vietnam.

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