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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