Alliance for Pandemic Preparedness

February 18, 2021

Differences in Rapid Increases in County-Level COVID-19 Incidence by Implementation of Statewide Closures and Mask Mandates — United States, June 1–September 30, 2020

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US county-level data from June to September 2020 show that counties in states that were closed for 0-59 days were more likely to experience rapidly increasing COVID-19 incidence (“rapid riser”) than those closed for >59 days, especially in non-metropolitan areas.  The probability of being a “rapid riser” county was 43% lower all among counties that had statewide mask mandates at reopening and 67% lower among non-metropolitan counties.

Dasgupta et al. (Feb 14, 2021). Differences in Rapid Increases in County-Level COVID-19 Incidence by Implementation of Statewide Closures and Mask Mandates — United States, June 1–September 30, 2020. Annals of Epidemiology. https://doi.org/10.1016/j.annepidem.2021.02.006