Well I was in South Korea just few weeks ago, where is ranked at top 4 in the world in terms of the number of people infected, so let me just share what is the most recommended to prevent it there.
1. Use KF94 mask or 3 layer mask that has waterproof that prevent spits or N95 mask (You can get them on ebay.com). KF94/N95 will work better than 3 layer. In any case, normal cheap cotton mask won't work because they can't prevent spits. Discard each mask if you used for 3...




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