Mask mandates and use are not associated with slower state-level COVID-19 spread during COVID-19 growth surges. Containment requires future research and implementation of existing efficacious strategies.

Damian D. Guerra, Daniel J. Guerra. Mask mandate and use efficacy in state-level COVID-19 containment. Pre-print. MedRxiv. 25 May 2021. https://doi.org/10.1101/2021.05.18.21257385.