The medical community in my area has come out with data that says children while not as likely to present symptoms of Covid, do carry a much higher viral load than adults when they contract it. That logically will lead to more adults contracting it from their children. And that tracks with data that says many more people contract Covid at home or from the people in their home due to the closer contact with family members. This information was not known back in March and April when schools were closed. The larger question is, which school districts wish to be the canary in the coal mine?