COVID-19 Mask Mandates

We extended previous studies on the impact of masks on COVID-19 outcomes by investigating an unprecedented breadth and depth of specifications, and our results demonstrate the policy implications for reinforcing the need to maintain and encourage mask-wearing by the public even after controlling for vaccination.

In this project, we show that mask mandates at the country-level (USA) had a significant positive effect on COVID outcomes (cases, hospitalizations and deaths), and that mask wearing (in 69 countries) similarly has a beneficial effect. This research was just published in the June issue of PLOS ONE, an open-access journal for multidisciplinary research in medicine and the sciences.


Collaborators include Matteo Chinazzi, Samuel P. Fraiberger, Alex Pentland, Kyle Staller, Alessandro Vespignani, and Deepak L. Bhatt.

Also, CCI Team members Samantha Bates & Karthik Dinakar pitched in.