According to the Ontario government's Management of COVID-19 in Schools Operational Guidance document, school boards are required to post any outbreaks that occur in schools.

In the interests of privacy, information provided to school communities will not identify the student or staff member that has received a positive COVID-19 test.

If the Windsor-Essex County Health Unit advises that a class, cohort or a school should be closed for a period of time, parents, students and staff will be notified immediately.
Confirmed cases and outbreaks, and the subsequent action being taken by the school, will be reported below as that information becomes available.

You can view a summary of confirmed school cases from across Ontario here.