More than 800 people in Auckland have now caught the measles, with more than 50 schools and a similar number of childcare centres experiencing cases this year.
More than 20 Auckland secondary schools have been notified that a student attending a school ball on Saturday night may have had measles - and any unvaccinated students were today urged to stay away from the college.
Free pop-up clinics set up to offer vaccinations without appointments in the city have been kept busy.
RNZ's Amy Williams reports.
