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11-25-2021, 05:49 AM
https://i.cbc.ca/1.6261722.1637799016!/fileImage/httpImage/image.jpg_gen/derivatives/16x9_460/mask-garbage.jpg Many doctors, engineers and scientists say the Public Health Agency of Canada's shift toward recommending medical masks and respirators over cloth masks is due to increased acknowledgement of aerosol transmission.
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