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> Just in your quote it stated that the control that cloth mask use was compared to was a population with a high proportion of mask wearing. The study does not compare cloth mask usage to no mask usage, and only says that it is possible that cloth masks are harmful.

That was me debunking the “before COVID, masks were known to work” claim of the GP. That was not a study of SARS-2 but rather Influenza.

The “masks don’t work for sars-2” was in reference to sars-2 aerosol transmission, which masks mechanistically don’t protect against. There is only one RCT of sars-2 in a community setting, and it failed to demonstrate an improvement in the primary endpoint of self-infection. There is no study showing that masks slow the spread of sars-2 in a community. Yet despite the lack of any studies, various medical authorities like the CDC are issuing statements that they do exactly that, which is a classic case of an institution using its credibility to advance baseless claims

[Valectar]

> There is no study showing that masks slow the spread of sars-2 in a community

You say that, and yet "At least ten studies have confirmed the benefit of universal masking in community level analyses"

https://www.cdc.gov/coronavirus/2019-ncov/science/science-br...

And the website goes on to list each of them, as well as a number of other studies relating to the effectiveness of masking.

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Those studies all have fundamental flaws. The basic problem is those are associative studies, which can’t separate the effects of masking from the normal curve of a viral epidemic.

You are right though I should have been much more specific than just “study”.

A question though: if masking is so great, why wouldn’t the health authorities have performed an actual RCT to conclusively prove they work? (We have one RCT for SARS-2 which showed no statistically significant effect on the primary endpoint)