Updates as of March 19, 2021:
- Revised physical distancing recommendations to reflect at least 3 feet between students in classrooms and provide clearer guidance when a greater distance (such as 6 feet) is recommended.
- Clarified that ventilation is a component of strategies to clean and maintain healthy facilities.
- Removed recommendation for physical barriers.
- Clarified the role of community transmission levels in decision-making.
- Added guidance on interventions when clusters occur.