The CDC guidance released Friday said that, in areas with “substantial community spread” of the coronavirus, closures need to last a minimum of four to eight weeks to serve as a “larger community mitigation strategy.”

As an unprecedented wave of schools were ordered to shut down in an attempt to slow the spread of the new coronavirus, new guidance from the Centers for Disease Control and Prevention suggests that many of the planned closures may not be long enough to effectively drive down transmission rates...

https://www.edweek.org/ew/articles/2020/03/13/millions-will-be-out-of-school-for-coronavirus.html?cmp=soc-fb-shr&fbclid=IwAR0iyXys40i9zFmIn5Lg5_GSBeTAvfcqKJLxss8ZetuqQN2llEpgzu_YGu8