Officials with Canada Post say an outbreak of COVID-19 has hit their massive facility.
They say 121 workers have tested positive since the start of the new year.
About 4,500 people work at the Dixie Road location.
A spokesman says public health officials have indicated most of the cases came from the broader community.

Niagara Airport Reveals Growth Plan
Police Looking for Mischief Suspects
NRP Investigating Car Fire
Federal Liberals Table Budget
Spend Tax Dollars Locally: MPP
Two People Charged with Human Trafficking
Niagara Falls Developing Road Plan
Welland's Foyer Richelieu Grows