| Dates | School | Confirmed Cases |
|---|
| Collected | Reported | School Board | School | Municipality | Student | Staff | Unspecified | Total |
|---|
| 2021-12-03 | 2021-12-06 | Niagara Catholic District School Board | St Denis Catholic Elementary School | St. Catharines | 1 | 0 | 0 | 1 |
| 2021-12-02 | 2021-12-03 | Niagara Catholic District School Board | St Denis Catholic Elementary School | St. Catharines | 1 | 0 | 0 | 1 |
| 2021-12-01 | 2021-12-02 | Niagara Catholic District School Board | St Denis Catholic Elementary School | St. Catharines | 2 | 0 | 0 | 2 |
| 2021-11-30 | 2021-12-01 | Niagara Catholic District School Board | St Denis Catholic Elementary School | St. Catharines | 2 | 0 | 0 | 2 |
| 2021-11-29 | 2021-11-30 | Niagara Catholic District School Board | St Denis Catholic Elementary School | St. Catharines | 2 | 0 | 0 | 2 |
| 2021-11-26 | 2021-11-29 | Niagara Catholic District School Board | St Denis Catholic Elementary School | St. Catharines | 2 | 0 | 0 | 2 |
| 2021-11-25 | 2021-11-26 | Niagara Catholic District School Board | St Denis Catholic Elementary School | St. Catharines | 2 | 0 | 0 | 2 |
| 2021-11-24 | 2021-11-25 | Niagara Catholic District School Board | St Denis Catholic Elementary School | St. Catharines | 2 | 0 | 0 | 2 |
| 2021-11-23 | 2021-11-24 | Niagara Catholic District School Board | St Denis Catholic Elementary School | St. Catharines | 2 | 0 | 0 | 2 |
| 2021-11-22 | 2021-11-23 | Niagara Catholic District School Board | St Denis Catholic Elementary School | St. Catharines | 2 | 0 | 0 | 2 |
| 2021-11-19 | 2021-11-22 | Niagara Catholic District School Board | St Denis Catholic Elementary School | St. Catharines | 1 | 0 | 0 | 1 |
| 2021-11-18 | 2021-11-19 | Niagara Catholic District School Board | St Denis Catholic Elementary School | St. Catharines | 1 | 0 | 0 | 1 |
| 2021-11-09 | 2021-11-10 | Niagara Catholic District School Board | St Denis Catholic Elementary School | St. Catharines | 1 | 0 | 0 | 1 |
| 2021-11-08 | 2021-11-09 | Niagara Catholic District School Board | St Denis Catholic Elementary School | St. Catharines | 1 | 0 | 0 | 1 |
| 2021-11-05 | 2021-11-08 | Niagara Catholic District School Board | St Denis Catholic Elementary School | St. Catharines | 1 | 0 | 0 | 1 |
| 2021-11-04 | 2021-11-05 | Niagara Catholic District School Board | St Denis Catholic Elementary School | St. Catharines | 1 | 0 | 0 | 1 |
| 2021-11-03 | 2021-11-04 | Niagara Catholic District School Board | St Denis Catholic Elementary School | St. Catharines | 1 | 0 | 0 | 1 |
| 2021-11-02 | 2021-11-03 | Niagara Catholic District School Board | St Denis Catholic Elementary School | St. Catharines | 1 | 0 | 0 | 1 |
| 2021-11-01 | 2021-11-02 | Niagara Catholic District School Board | St Denis Catholic Elementary School | St. Catharines | 1 | 0 | 0 | 1 |
| 2021-10-29 | 2021-11-01 | Niagara Catholic District School Board | St Denis Catholic Elementary School | St. Catharines | 1 | 0 | 0 | 1 |
| 2021-10-28 | 2021-10-29 | Niagara Catholic District School Board | St Denis Catholic Elementary School | St. Catharines | 1 | 0 | 0 | 1 |
| 2021-10-27 | 2021-10-28 | Niagara Catholic District School Board | St Denis Catholic Elementary School | St. Catharines | 1 | 0 | 0 | 1 |
| 2021-09-21 | 2021-09-22 | Niagara Catholic District School Board | St Denis Catholic Elementary School | St. Catharines | 0 | 1 | 0 | 1 |
| 2021-09-20 | 2021-09-21 | Niagara Catholic District School Board | St Denis Catholic Elementary School | St. Catharines | 0 | 1 | 0 | 1 |
| 2021-09-17 | 2021-09-20 | Niagara Catholic District School Board | St Denis Catholic Elementary School | St. Catharines | 0 | 1 | 0 | 1 |
| 2021-09-16 | 2021-09-17 | Niagara Catholic District School Board | St Denis Catholic Elementary School | St. Catharines | 0 | 1 | 0 | 1 |
| 2021-09-15 | 2021-09-16 | Niagara Catholic District School Board | St Denis Catholic Elementary School | St. Catharines | 0 | 1 | 0 | 1 |
| 2021-09-14 | 2021-09-15 | Niagara Catholic District School Board | St Denis Catholic Elementary School | St. Catharines | 0 | 1 | 0 | 1 |
| 2021-09-13 | 2021-09-14 | Niagara Catholic District School Board | St Denis Catholic Elementary School | St. Catharines | 0 | 1 | 0 | 1 |
| 2021-03-31 | 2021-04-01 | Niagara Catholic District School Board | St Denis Catholic Elementary School | St. Catharines | 2 | 0 | 0 | 2 |
| 2021-03-30 | 2021-03-31 | Niagara Catholic District School Board | St Denis Catholic Elementary School | St. Catharines | 2 | 0 | 0 | 2 |
| 2021-03-29 | 2021-03-30 | Niagara Catholic District School Board | St Denis Catholic Elementary School | St. Catharines | 2 | 0 | 0 | 2 |
| 2021-03-26 | 2021-03-29 | Niagara Catholic District School Board | St Denis Catholic Elementary School | St. Catharines | 2 | 0 | 0 | 2 |
| 2021-03-25 | 2021-03-26 | Niagara Catholic District School Board | St Denis Catholic Elementary School | St. Catharines | 2 | 0 | 0 | 2 |
| 2021-03-24 | 2021-03-25 | Niagara Catholic District School Board | St Denis Catholic Elementary School | St. Catharines | 2 | 0 | 0 | 2 |
| 2021-03-23 | 2021-03-24 | Niagara Catholic District School Board | St Denis Catholic Elementary School | St. Catharines | 2 | 0 | 0 | 2 |
| 2021-03-22 | 2021-03-23 | Niagara Catholic District School Board | St Denis Catholic Elementary School | St. Catharines | 2 | 0 | 0 | 2 |