The local public health department has declared a COVID-19 outbreak in a cohort at Grand River Collegiate Institute in Kitchener.
Public health officials have determined a student case has been linked to another in the same cohort.
No additional students or staff are required to isolate.
Public health also did not identify any other close contacts.
It's the third outbreak to be confirmed in a school cohort since Sunday. The others are at Parkway Public School and Hespeler Public School.