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Covid-19 2020-05 part three
Wearning Masks to Reduce Covid-19 Transmission
Breathing

a face mask may trap a virus or concentrate CO2      web

webhttps://www.sciencetimes.com/articles/25713/20200518/wearing-face-masks-potentially-harmful-trap-exhaled-viruses-well-individuals.htm
publicationScience Times
date2020-05-18

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