Alliance for Pandemic Preparedness

March 4, 2021

Impacts of Introducing and Lifting Nonpharmaceutical Interventions on COVID-19 Daily Growth Rate and Compliance in the United State

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  • Implementation of nonpharmaceutical interventions (NPIs), measured as the percentage of electronic devices staying at home, led to a reduction in COVID-19 cases among US counties. Implementing one NPI was associated with a reduction of the daily COVID-19 growth rate by 176 cases per 100,000, with a stronger reduction in counties with a higher proportion of non-white residents (210 cases per 100,000). The strongest reduction in cases came from NPIs targeting the general population and businesses. The study also found that when NPI measures were lifted, NPIs targeting vulnerable populations were associated with the largest increase in cases. After counties lifted NPIs, benefit from reduced mobility outside of the home during the lockdown was short-lived.

Singh et al. (Mar 23, 2021). Impacts of Introducing and Lifting Nonpharmaceutical Interventions on COVID-19 Daily Growth Rate and Compliance in the United States. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.2021359118