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I've only heard what the state epidemiologists say but here's the Finnish study that the current recommendations are based on: https://yle.fi/uutiset/osasto/news/report_little_or_no_benef...

With that said, Finland is re-evaluating face masks it as we speak so it may change.

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> five of eight systematic reviews found no evidence that the use of masks would provide any benefit in controlling sources of infection or protecting healthy persons from exposure to respiratory infections

Unfortunately, that news article does not contain the links to those reviews. Maybe they are part of the full report, but I can't read Finnish.

According to this research in the Lancet, masks help but not as much as physical distancing.

2 m distance reduces risk by 10x face mask reduces risk by 6x eye protection by 5x There is some uncertainty in these figures

https://www.thelancet.com/journals/lancet/article/PIIS0140-6...

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