A COVID-19 outbreak in a class cohort at Kitchener-Waterloo Collegiate & Vocational School was declared over on Wednesday.
Health officials had linked a student case to a previously reported case in the same cohort.
Due to it being more than 10 days since the last date of exposure to the second case, the outbreak is now over.
The cohort had already been released from isolation and was cleared to return to school on November 22.
No additional students or staff were required to self-isolate.