The CDC itself argues that they don't work by recommending people avoid gathering indoors, even with masks.
Example, CDC requires people to wear masks on airplanes, trains, schools, a big masked gathering that's allowed because CDC says it 'works'
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.
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