A warning has been issued on the link between Hepatitis A and imported frozen berries after four people were found to be ill with the virus.

There is a "potential risk" of Hepatitis being associated with eating the imported berries, says the Ministry for Primary Industries.

Four people have tested positive for Hepatitis A, which the MPI says could be linked to frozen berries. Photo: Kevin Stent.

MPI director of plants, food and environment Peter Thomson says investigations had not yet revealed a specific cause.

'But there is an association with consuming imported frozen berries. Recent outbreaks in other countries also suggest this link.”

The Ministry has instituted a surveillance programme, including additional testing, focussed on imported frozen berries.

Peter says safety of consumers is MPI's number one priority in taking the new measures.

'We're giving a very high priority to instigating a testing programme that will provide increased surveillance of imported frozen berries. This will include previously imported stocks held by food companies here.

'In the meantime, the general advice about food safety applies. People should wash their hands before eating and preparing food. Anyone who is concerned should briefly boil any frozen berries before eating them, or ensure cooking exceeds 85 degrees Celsius for one minute.

'Elderly people and those with chronic liver damage should avoid frozen berries that have not been heat treated,” says Peter.

'If you're concerned about a potential risk to your health, or the health of others, you should seek advice from your medical practitioner, or call the Ministry of Health's Healthline (0800 611 116).

'If you are concerned about the safety of food products, contact the MPI consumer helpline (0800 008 333).”