In order to minimize the spread of COVID-19 during March and April, U.S. state and local governments joined worldwide efforts to impose social distancing measures. A paper from the journal Health Affairs published today examined the impact of selected measures on the COVID-19 growth rate after different periods of days.
The paper can be obtained at https://www.healthaffairs.org/doi/pdf/10.1377/hlthaff.2020.00608.