Social distancing to slow the US COVID-19 epidemic: Longitudinal pretest–posttest comparison group study

Across US States social distancing measures played a major role in slowing the spread of COVID-19 this spring, researchers have reported. Between March 10 and March 25, all 50  American states and the District of Columbia adopted at least one form of social distancing. These restrictions prevented 621,000 cases of COVID-19 across the United States within three weeks of being implemented, the researchers estimated. In addition, after a state enacted social distancing, its rate of deaths related to COVID-19 dropped, on average, after one week.

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