More than 100 cases of measles have been confirmed in Auckland over the past five days.
Auckland Regional Public Health said there were 616 cases in the region on Friday – an increase of 109 cases Monday – with the majority in the Manukau area.
Auckland is experiencing a highly contagious disease, and the country as a whole is experiencing the worst outbreak of measles in a decade.
So far, cases have been confirmed from Northland to Danesden, through 16 of the country's 20 county health boards.
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This year's series of cases is the fourth in a decade. In 2009 there were 248 confirmed cases, 596 in 2011 and 280 in 2014.
The last two large outbreaks of measles in New Zealand occurred in the 1990s, with thousands of cases, hundreds of hospitalizations and seven deaths.
Usually, about one in 10 people with measles will require hospital treatment.
The virus can cause complications, including diarrhea, pneumonia, seizures and, in rare cases, brain swelling.
Symptoms of measles include fever, cough, runny nose and sore, red eyes.
Within a few days, a rash on the face and neck appears before the lower body expands.
Anyone born in or after 1969 who did not have two documented doses of the MMR vaccine (measles, mumps, rubella) can be vaccinated for free.
For more information, call Healthline on 0800 611 116 or visit the ARPHS or Department of Health websites.