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12 h, aug 21, 2020 y - CDC: We know [wearing masks] works

Description:

https://www.cdc.gov/media/releases/2020/t0821-telebriefing-covid.html

Added to timeline:

Nathan Rich: COVID-19 in the USA

28 Apr 2022

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Date:

12 h, aug 21, 2020 y

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~ 5 years ago

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