Where do they literally say it works to prevent transmission of COVID-19?
Where does Moderna and Pfizer say vaccine prevents transmission? They don't. No one is going to say the mask or the vax prevents anything.
So you can't say the CDC argues that the mask works.
CDC says masks work as risk reduction, CDC says vax is risk reduction, CDC says distancing is risk reduction, and won't ever say prevention for any of them. A reasonble accomodation is mask or distancing if not vaxxed. Right now, good luck getting CDC to say masks don't work, they still want vaxxed to wear masks
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