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New Covid wave has begun and masks should be worn again, scientists warn
(www.independent.co.uk)
this post was submitted on 17 Aug 2023
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Mask lower probability of the wearer to transmit virus by trapping droplets of saliva, as those droplets are the main virus vector.
Multiply this decrease of probability to population - and you will have significant effect.
Hospitals crave that effect, because it gives them a break.