As the COVID-19 pandemic evolves and restrictions loosen, NBOA, in consultation with engineers and industrial hygienists from Environmental Health & Engineering (EH&E), has produced a Supplement to Operating Guidance for Independent School Pandemic Management to help guide schools in planning for the 2021-22 school year. This update covers the latest research on the spread of COVID-19 and virus variants, vaccines that protect against the virus, and practices to mitigate risk on school campuses.