Another seven cases of measles have been confirmed in the Auckland region, taking the number of notified cases in the area to 52 this year.
Some 26 of those cases are students of Westlake Boys' High School and family members.
North Shore Hospital and Waitakere Hospital emergency departments had seen seven confirmed cases of measles since January 1, five of them at North Shore Hospital since February 1, health officials said.
The recent increase in community-spread cases was a strong reminder to immunise, Waitemata DHB chief executive Dale Bramley said.
"Immunisation is the only effective protection for yourself, your family and to limit spread in the community," said Dr Bramley, a public health physician.