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How effective are prevention measures against COVID-19?

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COVID-19 is a new disease so data is limited, but a 2017 CDC report about pandemic flu concluded that actions like the ones listed above dramatically slowed the spread of influenza in communities and reduced the peak number of cases and demands on hospitals during pandemics. The total number of overall cases and ill health effects related to the flu also dropped. (see figure below).

Flattening the curve diagram
Image credit: CDC, US Department of Health and Human Services
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