A vacant teachers desk is pictured at the front of a empty classroom is pictured at McGee Secondary school in Vancouver, B.C. Friday, Sept. 5, 2014. The Manitoba government says it is closing schools for three weeks because of COVID-19. Education Minister Kelvin Goertzen says classes will be suspended starting Monday. THE CANADIAN PRESS/Jonathan Hayward

Greater Saskatoon Catholic Schools has announced a case of COVID-19 at École St. Peter School in the city.

The school board said in a letter the person was at the school while infectious at the end of last week.

“We are working closely with Public Health staff to ensure necessary measures are in place to protect all students,” it said on Sunday.  “The virus spreads from person to person by large, respiratory droplets, like from a cough or sneeze.”

The school board is not naming the person who tested positive. It said the risk of exposure for anyone not considered a close contact is low.