Now? Strongly encourage everyone to get vaccinated (to protect themselves, not others — the current vaccines don’t provide substantial protection to others any more). Encourage people who feel the need for extra personal protection to wear N95 masks and feel comfortable doing so. Encourage anyone who is sick to stay home (which was good sense before COVID anyway). Try to improve ventilation (which is also a good idea regardless of COVID). Encourage students to spend more time outside (again, a good idea regardless of COVID). And accept that outbreaks are going to happen.
There is, currently, no magic bullet available that will work in a school setting.
There is, currently, no magic bullet available that will work in a school setting.