| Dates | School | Confirmed Cases |
|---|
| Collected | Reported | School Board | School | Municipality | Student | Staff | Unspecified | Total |
|---|
| 2021-09-13 | 2021-09-14 | York Catholic District School Board | St Kateri Tekakwitha Catholic Elementary School | Markham | 1 | 0 | 0 | 1 |
| 2021-04-08 | 2021-04-09 | York Catholic District School Board | St Kateri Tekakwitha Catholic Elementary School | Markham | 1 | 0 | 0 | 1 |
| 2021-04-07 | 2021-04-08 | York Catholic District School Board | St Kateri Tekakwitha Catholic Elementary School | Markham | 1 | 0 | 0 | 1 |
| 2021-04-06 | 2021-04-07 | York Catholic District School Board | St Kateri Tekakwitha Catholic Elementary School | Markham | 1 | 0 | 0 | 1 |
| 2021-04-01 | 2021-04-06 | York Catholic District School Board | St Kateri Tekakwitha Catholic Elementary School | Markham | 1 | 0 | 0 | 1 |
| 2021-03-31 | 2021-04-01 | York Catholic District School Board | St Kateri Tekakwitha Catholic Elementary School | Markham | 1 | 0 | 0 | 1 |
| 2021-03-30 | 2021-03-31 | York Catholic District School Board | St Kateri Tekakwitha Catholic Elementary School | Markham | 1 | 0 | 0 | 1 |
| 2021-03-29 | 2021-03-30 | York Catholic District School Board | St Kateri Tekakwitha Catholic Elementary School | Markham | 1 | 0 | 0 | 1 |
| 2021-03-26 | 2021-03-29 | York Catholic District School Board | St Kateri Tekakwitha Catholic Elementary School | Markham | 1 | 0 | 0 | 1 |