| Dates | School | Confirmed Cases |
|---|
| Collected | Reported | School Board | School | Municipality | Student | Staff | Unspecified | Total |
|---|
| 2021-11-16 | 2021-11-17 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 0 | 1 | 0 | 1 |
| 2021-11-15 | 2021-11-16 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 2 | 1 | 0 | 3 |
| 2021-11-12 | 2021-11-15 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 2 | 1 | 0 | 3 |
| 2021-11-11 | 2021-11-12 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 2 | 1 | 0 | 3 |
| 2021-11-10 | 2021-11-11 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 2 | 1 | 0 | 3 |
| 2021-11-09 | 2021-11-10 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 2 | 1 | 0 | 3 |
| 2021-11-08 | 2021-11-09 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 4 | 1 | 0 | 5 |
| 2021-11-05 | 2021-11-08 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 4 | 1 | 0 | 5 |
| 2021-11-04 | 2021-11-05 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 4 | 1 | 0 | 5 |
| 2021-11-03 | 2021-11-04 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 4 | 1 | 0 | 5 |
| 2021-11-02 | 2021-11-03 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 4 | 0 | 0 | 4 |
| 2021-11-01 | 2021-11-02 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 2 | 0 | 0 | 2 |
| 2021-10-29 | 2021-11-01 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 2 | 0 | 0 | 2 |
| 2021-10-28 | 2021-10-29 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 2 | 0 | 0 | 2 |
| 2021-10-27 | 2021-10-28 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 2 | 0 | 0 | 2 |
| 2021-10-26 | 2021-10-27 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 2 | 0 | 0 | 2 |
| 2021-10-14 | 2021-10-15 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 1 | 0 | 0 | 1 |
| 2021-10-13 | 2021-10-14 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 1 | 0 | 0 | 1 |
| 2021-10-12 | 2021-10-13 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 1 | 0 | 0 | 1 |
| 2021-10-08 | 2021-10-12 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 1 | 0 | 0 | 1 |
| 2021-10-07 | 2021-10-08 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 2 | 0 | 0 | 2 |
| 2021-10-06 | 2021-10-07 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 3 | 0 | 0 | 3 |
| 2021-10-05 | 2021-10-06 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 3 | 0 | 0 | 3 |
| 2021-10-04 | 2021-10-05 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 3 | 0 | 0 | 3 |
| 2021-10-01 | 2021-10-04 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 3 | 0 | 0 | 3 |
| 2021-09-30 | 2021-10-01 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 1 | 0 | 0 | 1 |
| 2021-09-29 | 2021-09-30 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 1 | 0 | 0 | 1 |
| 2021-09-28 | 2021-09-29 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 1 | 0 | 0 | 1 |
| 2021-09-27 | 2021-09-28 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 1 | 0 | 0 | 1 |
| 2021-09-24 | 2021-09-27 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 1 | 1 | 0 | 2 |
| 2021-09-23 | 2021-09-24 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 0 | 1 | 0 | 1 |
| 2021-09-22 | 2021-09-23 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 0 | 1 | 0 | 1 |
| 2021-09-21 | 2021-09-22 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 0 | 1 | 0 | 1 |
| 2021-09-20 | 2021-09-21 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 0 | 1 | 0 | 1 |
| 2021-09-17 | 2021-09-20 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 0 | 1 | 0 | 1 |
| 2021-09-16 | 2021-09-17 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 0 | 1 | 0 | 1 |
| 2021-09-15 | 2021-09-16 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 0 | 1 | 0 | 1 |
| 2021-09-14 | 2021-09-15 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 0 | 1 | 0 | 1 |
| 2021-09-13 | 2021-09-14 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 0 | 1 | 0 | 1 |
| 2021-03-31 | 2021-04-01 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 0 | 1 | 0 | 1 |
| 2021-03-30 | 2021-03-31 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 0 | 1 | 0 | 1 |
| 2021-03-29 | 2021-03-30 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 0 | 1 | 0 | 1 |
| 2021-03-26 | 2021-03-29 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 0 | 1 | 0 | 1 |
| 2021-03-25 | 2021-03-26 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 0 | 1 | 0 | 1 |
| 2021-03-24 | 2021-03-25 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 0 | 1 | 0 | 1 |
| 2021-03-23 | 2021-03-24 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 0 | 1 | 0 | 1 |
| 2021-03-22 | 2021-03-23 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 0 | 1 | 0 | 1 |
| 2021-03-12 | 2021-03-15 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 1 | 0 | 0 | 1 |
| 2021-03-11 | 2021-03-12 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 1 | 0 | 0 | 1 |
| 2021-03-10 | 2021-03-11 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 1 | 0 | 0 | 1 |
| 2021-03-09 | 2021-03-10 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 1 | 0 | 0 | 1 |
| 2021-03-08 | 2021-03-09 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 1 | 0 | 0 | 1 |
| 2021-03-05 | 2021-03-08 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 1 | 0 | 0 | 1 |
| 2021-03-04 | 2021-03-05 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 1 | 0 | 0 | 1 |
| 2021-03-03 | 2021-03-04 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 1 | 0 | 0 | 1 |
| 2021-03-02 | 2021-03-03 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 1 | 0 | 0 | 1 |
| 2021-03-01 | 2021-03-02 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 1 | 0 | 0 | 1 |
| 2020-12-11 | 2020-12-14 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 1 | 0 | 0 | 1 |
| 2020-12-10 | 2020-12-11 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 1 | 0 | 0 | 1 |
| 2020-12-09 | 2020-12-10 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 1 | 0 | 0 | 1 |
| 2020-12-08 | 2020-12-09 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 3 | 0 | 0 | 3 |
| 2020-12-07 | 2020-12-08 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 3 | 0 | 0 | 3 |
| 2020-12-04 | 2020-12-07 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 4 | 0 | 0 | 4 |
| 2020-12-03 | 2020-12-04 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 4 | 0 | 0 | 4 |
| 2020-12-02 | 2020-12-03 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 4 | 0 | 0 | 4 |
| 2020-12-01 | 2020-12-02 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 4 | 0 | 0 | 4 |
| 2020-11-30 | 2020-12-01 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 4 | 0 | 0 | 4 |
| 2020-11-27 | 2020-11-30 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 3 | 0 | 0 | 3 |
| 2020-11-26 | 2020-11-27 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 3 | 0 | 0 | 3 |
| 2020-11-25 | 2020-11-26 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 3 | 0 | 0 | 3 |
| 2020-11-24 | 2020-11-25 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 1 | 0 | 0 | 1 |
| 2020-11-23 | 2020-11-24 | York Region District School Board | Dr John M Denison Secondary School | Newmarket | 1 | 0 | 0 | 1 |