UPDATE, Thursday, September 17: All 140 staff and students at Fellowes High School in Pembroke are being tested for the virus.
The Renfrew County and District Health Unit (RCDHU) has ordered the closure of Fellowes High School in Pembroke.
According to the Renfrew County District School Board, the decision was made shortly after a third case was confirmed on Wednesday, linked to two previous cases.
The closure is effective immediately and is expected to remain in place until further notice.
The school board says it will reopen the school once the RCDHU gives it the green light.
Students are being asked to check their school emails for information from their teacher regarding continued online learning.