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.
NRPS Buying Body Cameras for Officers
Police services board approved it for next year's budget, at a $1.2-million cost with US tariffs considered, after overwhelming community support
Arrests Made in Overdose Death
A 63-year old man was found dead in Niagara Falls motel last November
Truck Rammed into Harmony Jewellers
Pictures released by police... dramatic video online shows 5 criminals robbing store
NRP Monitoring Tariffs and Buying
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St. Catharines Residents Charged in Huge Drug Bust
Police say Outlaw gang members involved from Toronto to Niagara and Nova Scotia
Body Found Near Lake in Wainfleet
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Man Shot at Pearson Airport
Police say officers fired at him as he showed a gun while in Terminal 1 departures, the man died at hospital
NRP Looking for Man After Library Incident
Police called to the St. Catharines library