
What masks do the best job? That would be N95 masks without valves, followed by surgical or polypropylene masks.
from WebMD Healthhttps://img.webmd.com/dtmcms/live/webmd/consumer_assets/site_images/article_thumbnails/news/2020/03_2020/covid19/1800x1200_covid19_16.jpg https://ift.tt/33C6CNu
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