The Ministry for Primary Industries (MPI) is warning people not to eat two Paroa Bay Oysters products after several people are believed to have fallen ill.
In a statement, MPI said the company is recalling specific batches of its oysters - Paroa Bay brand raw oysters in a 200ml pottle (purchased between July 30 and August 5) and Paroa Bay oysters sold fresh from its shop from July 30.
"There have been several cases reported of foodborne illness in Northland and Auckland."
Jenny Bishop of New Zealand Food Safety said anyone who bought the oysters should return them to the retailer for a refund or throw them out.
"See your doctor if you or a family member has had vomiting or diarrhoea for longer than three days. Also, you can phone Healthline for advice on 0800 61 11 16 or seek medical attention immediately."
According to MPI, people who have low immunity should contact their doctor immediately if they suspect they have food poisoning.
Other common symptoms of food poisoning include allergic reactions, headache, stomach pains, fever and muscle aches.
"Take care when handling, preparing and consuming shellfish. If you have low immunity or are immune-compromised, you should not eat raw or undercooked shellfish," Bishop said.