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Can you please share an US based study which shows that mask mandates are effective? I’m really puzzled but that part.


I can understand why you're puzzled, as my comment was not about mask mandates.

But in the spirit of helping, roughly 6 seconds of Googling in regards to your question turned up this https://www.healthaffairs.org/doi/10.1377/hlthaff.2021.01072




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