"A D-grade means that faults that are not a critical risk to food safety were found on the premises and intervention by a food safety officer was required," a council spokesperson told Newshub.

"E-grades are issued to businesses with critical food safety risks. When a critical risk to food safety is found, the business will immediately close and will reopen when the critical food safety risk has been addressed.

"For example, if a food business is found to have extensive cockroach infestation, it will not be permitted to reopen, unless the cockroach infestation has been satisfactorily mitigated."

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