The Saskatchewan Health Authority has reportedly alerted the Lumsden High School of a positive COVID-19 case.
The Prairie Valley School division will not say if the person who tested positive for the virus is a student, teacher or staff member.
The school was cleaned over the weekend following all protocols, and classes resumed in full on Monday.
The SHA is continuing to investigate and do contact tracing.
There are currently 145 active cases of COVID-19 in Saskatchewan, 22 of them are in the Regina region.