Another two people have tested positive for COVID-19 at St. Martin Catholic Elementary in Smithville.
But Niagara Catholic says they're not linked to the outbreak that was declared on Thursday.
Both of the newly infected individuals are self-isolating and contact tracing is underway.
Public Health says there was no risk of exposure for one of the cases.
The principal has sent a letter to all staff and students to notify them of the situation.
Police Find Missing Senior
Antoinette Fryns is safe now
Cyclist Killed in Niagara on the Lake
Police have charged a 22-year old man with impaired driving causing death
Province Investing Against Invasive Species
The $2-million will help the Niagara region
Niagara Driver Charged with Drug Impairment
OPP say this happened on Highway 17, when a car was seen weaving all over the road
Welland Man Arrested for Child Porn
Police say they noticed child sexual abuse material shared on a social media page early this month
28 More Doctors Hired in Niagara
The region and Niagara Health coordinating new partnership to find even more doctors
Killed Police Officers Honoured by NRP
Police Chief praised Niagara members for standing at attention in 'pounding rain'
Niagara Wineries Shuttle Service Possible
The CUTRIC hopes the province supports helping people move among wineries