This is a great and comprehensive article that hit the net today, authored by four professors at Harvard School of Public Health who are very plugged into the topic. I think it addresses your concerns.

https://www.bostonglobe.com/2020/07/20/opinion/listen-science-reopen-schools/?fbclid=IwAR3krVBmXxTy8McEPYZdE3_5D4lGfxtgqBmwx84veOhx7DUeHbg9XQ3GJ_U