The Ministry for Primary Industries (MPI) is reminding consumers to take care when drinking raw unpasteurised milk.
MPI Director Animal and Animal Products Matthew Stone says raw milk is considered a high risk food and it's important that consumers understand this.
Raw milk is milk that has not been pasteurised (heat treated) to kill harmful bacteria like E. coli, Campylobacter and Salmonella that are potentially present in the milk.
"Many people who drink raw milk do not always fully understand the risks and don’t realise that there is the possibility of getting sick from the harmful bacteria in the milk."
"Pregnant women, young children (particularly babies), the elderly, and people with weakened immune systems should not drink raw milk as they are at greatest risk of getting sick and the consequences for them can be more severe, and in some cases can lead to death," says Mr Stone.
"No matter how carefully the animals are milked there is always a risk that harmful bacteria can get into the milk. There is no way of telling by taste, sight or smell if the milk you are drinking contains any harmful bacteria so we recommend that people heat their raw milk until just boiling (or to 70 degrees Celsius for one minute) before drinking it."
Keeping raw milk refrigerated (4 degrees Celsius or less) also reduces the risk of any harmful bacteria in the milk growing to levels which make people sick when they drink it. People should discard the milk if it has been left out of the fridge and has reached room temperature.
"People who choose to drink raw milk should make sure they are getting their milk directly from the farmer and are only buying it for personal and household consumption."