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New Covid wave has begun and masks should be worn again, scientists warn
(www.independent.co.uk)
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https://www.cochrane.org/CD006207/ARI_do-physical-measures-such-hand-washing-or-wearing-masks-stop-or-slow-down-spread-respiratory-viruses
Read it. Then read it again.
You need to reread it more carefully.
“I know you are but what am I.” Ok. Maybe try posting something substantive that argues towards something useful.