Dunedin South's Countdown has now closed for 48 hours - after more rats have been found.
The supermarket made headlines last month when staff told the Otago Daily Times about a rat infestation.
Employees said they feared the public could have bought contaminated food.
Woolworth's stores director Jason Stockill told Heather du Plessis-Allan they've pro-actively closed - to let pest-control workers thoroughly check the store.
He says MPI and Rentokil have confirmed they're not nesting in the store and it's not a food safety issue.
Stockill says the rats are coming from outside - and Rentokil will be figuring out how they're getting in.
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