The Department of Disease Control has advised the public to wear two layers of masks to prevent the COVID-19 infection while in congested places. People should wear a fabric mask on top of a surgical or medical face mask.
The two layers of masks can prevent the spread of the virus up to 90%. If you cannot avoid being in crowded places for a long time and cannot maintain social distancing, or have to get close to people with a high risk of getting an infection, wearing two layers of masks can help prevent the spread of the disease. (NNT)
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