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The emergence of SARS-CoV-2 and the coronavirus infectious disease (COVID-19)has become a pandemic. Social (physical) distancing is a key non-pharmacologiccontrol measure to reduce the transmission rate of SARS-COV-2, but high-leveladherence is needed. Using daily travel distance and stay-at-home time derivedfrom large-scale anonymous mobile phone location data provided by DescartesLabs and SafeGraph, we quantify the degree to which social distancing mandateshave been followed in the U.S. and its effect on growth of COVID-19 cases. Thecorrelation between the COVID-19 growth rate and travel distance decay rate anddwell time at home change rate was -0.586 (95% CI: -0.742 ~ -0.370) and 0.526(95% CI: 0.293 ~ 0.700), respectively. Increases in state-specific doublingtime of total cases ranged from 1.04 ~ 6.86 days to 3.66 ~ 30.29 days aftersocial distancing orders were put in place, consistent with mechanisticepidemic prediction models. Social distancing mandates reduce the spread ofCOVID-19 when they are followed.

Mobile phone location data reveal the effect and geographic variation of social distancing on the spread of the COVID-19 epidemic