Someone at Nelles Public School in Grimsby has tested positive for COVID-19.
The DSBN says they're now self-isolating and Public Health will be reaching out to their close contacts.
The school will undergo a thorough cleaning and it will be assessed by a Public Health inspector.
The school board also reported another six new cases last night.
This includes three at Forestview Public School, two at Lincoln Centennial Public School and one at Lockview Public School.
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