Before revision:  The bottom-line is a simple policy prescription for institutions: distribute the total tests over several batches instead of using them all at once  .
After revision:  The bottom-line is a simple policy prescription for institutions: distribute the total tests over several batches instead of using them all at once . We expect that in the appropriate scenarios, this easy-to-implement policy recommendation will lead to earlier detection and better mitigation of local COVID-19 outbreaks .