Case of COVID at Grimsby high school, but student had not been in class for a week

There is now a confirmed case of COVID-19 at a Grimsby high school.
Niagara Catholic has been advised that an individual at Blessed Trinity Catholic Secondary School has tested positive, but has not been inside the school since September 30th. 
As a result, Niagara Region Public Health has determined that there is no risk of transmission to the school community.