The public health agency had previously emphasized that masks protect other people from viruses you might expel. The new advice gives a less altruistic reason to wear face coverings.
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Best Mask to Prevent COVID-19 and How Do Cloth, Disposable, N95, and KN95 Masks Compare
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Best Mask to Prevent COVID-19 and How Do Cloth, Disposable, N95, and KN95 Masks Compare