If that's your standard, then you can never open up schools (or restaurants, or movie theaters, or parks, or beaches) again, at least not until all disease is e

If that's your standard, then you can never open up schools (or restaurants, or movie theaters, or parks, or beaches) again, at least not until all disease is eradicated. People, including children, have died of the seasonal flu every single year that there have been schools, and many of them contracted it at school.