Auckland could be on the verge of a major measles outbreak.
Two new confirmed cases of the measles have health authorities concerned as they can not be linked to any previous notified cases or overseas strains of the virus.
Medical Officer of Health Dr Richard Hoskins says this suggests it is spreading throughout the community.
"Clearly they've been in contact in the two to three weeks before they became ill, with somebody with measles, that they don't know about and we don't know about."
He says it is a major concern that the diseases could be spreading further in the community.
"Now that we know there are cases that we can't link back, it makes us more concerned that there are other cases of measles in our community and that we might end up with another big outbreak like we had in 2011-2012."
Photo / Edward Swift / Newstalk ZB