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It sounds like it's recommended because a significant portion of people with coronavirus are asymptomatic or pre-symptomatic, and the virus can spread through speaking, coughing or sneezing.

There's no "proof" that these work, but there's a hope that it helps along with hand washing and a distance of six feet.

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Roko Mijic - Twitter

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Twitter Post - Interaction of mandated behavioral change and personal/religious beliefs

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