Hundreds of COVID-19 cases have been confirmed in Ontario schools in the past 14 days.
According to the Ontario government, 844 cases have been reported in two weeks.
The numbers were updated on Monday, just weeks after Toronto, Peel and York regions allowed schools to reopen for in-person learning.
Currently, 20 schools have closed their doors due to the high number of cases.
Public Health Sudbury & Districts announced on Sunday that they would be closing the doors of two of their schools, Jean Hanson Public School and Algonquin Public School, after outbreaks were reported.
All students and staff are being told to self-isolate and get tested as soon as possible.
Last month, Education Minister Stephen Leece announced that March Break would be postponed for students until April 12, in an attempt to curb the spread of COVID-19.