spread amongst the population more easily....as noted in the linked article.
Once again, for the slow learners...it's a fundamental epidemiology to have persons not get close to one another during an airborne virus pandemic...if the virus can't reach other hosts...it dies. Is that beyond your ability to comprehend?
Link: https://thehill.com/opinion/education/5407059-teachers-unions-covid-19-school-closures/