A video recording showed that the 3-ply surgical mask was the most effective, but even a single-layer mask reduced the spread of droplets.
from WebMD Healthhttps://img.webmd.com/dtmcms/live/webmd/consumer_assets/site_images/article_thumbnails/other/homemade_face_mask_covid19_other/1800x1200_homemade_mask_covid19_4_other.jpg https://ift.tt/39rMlLx
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