| Dates | School | Confirmed Cases |
|---|
| Collected | Reported | School Board | School | Municipality | Student | Staff | Unspecified | Total |
|---|
| 2020-11-23 | 2020-11-24 | Wellington Catholic District School Board | Holy Trinity Catholic School | Guelph | 3 | 0 | 0 | 3 |
| 2020-11-20 | 2020-11-23 | Wellington Catholic District School Board | Holy Trinity Catholic School | Guelph | 3 | 0 | 0 | 3 |
| 2020-11-19 | 2020-11-20 | Wellington Catholic District School Board | Holy Trinity Catholic School | Guelph | 3 | 0 | 0 | 3 |
| 2020-11-18 | 2020-11-19 | Wellington Catholic District School Board | Holy Trinity Catholic School | Guelph | 3 | 0 | 0 | 3 |
| 2020-11-17 | 2020-11-18 | Wellington Catholic District School Board | Holy Trinity Catholic School | Guelph | 3 | 0 | 0 | 3 |
| 2021-12-22 | 2021-12-23 | St Clair Catholic District School Board | Holy Trinity Catholic School | Sarnia | 0 | 1 | 0 | 1 |
| 2021-12-21 | 2021-12-22 | St Clair Catholic District School Board | Holy Trinity Catholic School | Sarnia | 0 | 1 | 0 | 1 |
| 2021-12-20 | 2021-12-21 | St Clair Catholic District School Board | Holy Trinity Catholic School | Sarnia | 0 | 1 | 0 | 1 |
| 2021-12-17 | 2021-12-20 | St Clair Catholic District School Board | Holy Trinity Catholic School | Sarnia | 0 | 1 | 0 | 1 |
| 2021-12-16 | 2021-12-17 | St Clair Catholic District School Board | Holy Trinity Catholic School | Sarnia | 0 | 1 | 0 | 1 |
| 2021-12-15 | 2021-12-16 | St Clair Catholic District School Board | Holy Trinity Catholic School | Sarnia | 0 | 1 | 0 | 1 |
| 2021-03-31 | 2021-04-01 | St Clair Catholic District School Board | Holy Trinity Catholic School | Sarnia | 1 | 0 | 0 | 1 |
| 2021-03-30 | 2021-03-31 | St Clair Catholic District School Board | Holy Trinity Catholic School | Sarnia | 1 | 0 | 0 | 1 |
| 2021-03-29 | 2021-03-30 | St Clair Catholic District School Board | Holy Trinity Catholic School | Sarnia | 2 | 1 | 0 | 3 |
| 2021-03-26 | 2021-03-29 | St Clair Catholic District School Board | Holy Trinity Catholic School | Sarnia | 2 | 2 | 0 | 4 |
| 2021-03-25 | 2021-03-26 | St Clair Catholic District School Board | Holy Trinity Catholic School | Sarnia | 2 | 2 | 0 | 4 |
| 2021-03-24 | 2021-03-25 | St Clair Catholic District School Board | Holy Trinity Catholic School | Sarnia | 2 | 2 | 0 | 4 |
| 2021-03-23 | 2021-03-24 | St Clair Catholic District School Board | Holy Trinity Catholic School | Sarnia | 2 | 2 | 0 | 4 |
| 2021-03-22 | 2021-03-23 | St Clair Catholic District School Board | Holy Trinity Catholic School | Sarnia | 2 | 2 | 0 | 4 |
| 2021-03-19 | 2021-03-22 | St Clair Catholic District School Board | Holy Trinity Catholic School | Sarnia | 1 | 2 | 0 | 3 |
| 2021-03-18 | 2021-03-19 | St Clair Catholic District School Board | Holy Trinity Catholic School | Sarnia | 1 | 2 | 0 | 3 |
| 2021-03-17 | 2021-03-18 | St Clair Catholic District School Board | Holy Trinity Catholic School | Sarnia | 1 | 2 | 0 | 3 |
| 2021-03-16 | 2021-03-17 | St Clair Catholic District School Board | Holy Trinity Catholic School | Sarnia | 1 | 2 | 0 | 3 |
| 2021-03-15 | 2021-03-16 | St Clair Catholic District School Board | Holy Trinity Catholic School | Sarnia | 0 | 1 | 0 | 1 |