You keep clinging to that.
CDC studies over decades showed masks were ineffective vs influenza like viruses. Why suddenly masks will work now vs a similar type of virus?
In Feb of this year, the European version of the CDC said the following.
1) They point out that masks have never been shown to be effective in stopping the flu.
2) They say medical masks are associated with only a small to moderate affect of stopping covid. They then immediately make the caveat that there are still SIGNIFICANT uncertainties about about the size and effect.
This means they cannot really prove they (masks) make much of a difference.
3) Evidence of non medical mask protection is scarce and of very low uncertainty.
4) They point out that more studies are needed to determine if medical masks are actually effective.
In sum, they are saying they just don't know if or how effective masks are.
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