PROVIDENCE, R.I. (AP) — Pandemic expert Dr. Ashish Jha says school districts across the country need to follow four rules to ensure that students and their teachers remain protected from the coronavirus this fall.

Jha said Thursday in the latest edition of the “COVID: What Comes Next” podcast hosted by The Providence Journal the rules are vaccinations for all who are eligible; proper ventilation and related mitigation measures in buildings; regular testing; and masks.

He says school safety is personal for him, as he has children who attend public schools.

Ventilation is essential because COVID-19 is an airborne disease.

Testing is important to pick up infections before they get a chance to spread.