Face masks with exhale valves and face shields may not be as effective as regular masks in restricting the spread of aerosol droplets, and could potentially hamper Covid-19 mitigation efforts, researchers, including those of Indian origin, have found.
from Science News - Times of India https://ift.tt/3hPJOhH
Wednesday, September 2, 2020
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» Face masks with exhale valves may hamper Covid-19 mitigation efforts: Study
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