Before revision:  Mean county-level daily growth in COVID-19 infections peaked at 17.2\% just before stay-at-home  orders were issued.
After revision:  Mean county-level daily growth in COVID-19 infections peaked at 17.2\% just before stay-at-home orders using a difference-in-differences design that accounts for unmeasured local variation in factors like health systems and demographics and for unmeasured temporal variation in factors like national mitigation actions and access to tests. Compared to counties that did not implement stay-at-home orders were issued.