Alliance for Pandemic Preparedness

April 9, 2021

Use of Stay-at-Home Orders and Mask Mandates to Control COVID-19 Transmission — Blackfeet Tribal Reservation, Montana, June–December 2020

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  • In the Blackfeet Tribal Reservation (Montana), enforcement of stay-at-home orders and mandated use of face coverings in public, with potential fines and jail for noncompliance, were associated with a 33-fold reduction in COVID-19 incidence from its peak of 6.4 cases per 1,000 residents per day on October 5 to 0.2 cases per 1,000 residents per day on November 7, 2020. Montana’s stay-at-home order expired on July 31 and the subsequent opening of campgrounds and several community events and gatherings resulted in a 63-fold increase in cases on the Reservation through September. On September 28, the stay-at-home order was re-issued with strict enforcement, after which cases declined.  

Pratt et al. (Apr 9, 2021). Use of Stay-at-Home Orders and Mask Mandates to Control COVID-19 Transmission — Blackfeet Tribal Reservation, Montana, June–December 2020. MMWR. https://doi.org/10.15585/mmwr.mm7014a3