Researchers concluded single-layer cloth masks are less effective while tight-fitting N95 masks provide best protection.
from Al Jazeera English https://ift.tt/3eFi7WF
from Al Jazeera English https://ift.tt/3eFi7WF
Masks and social distancing work, new analysis finds
![Masks and social distancing work, new analysis finds]()
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June 01, 2020
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