Measles could be a very serious illness, one in three sufferers experiencing complications such as ear infections, pneumonia, bronchitis or diarrhoea. And while, on average, one victim in 10 would be hospitalised, admission rates in the on-going Hamilton outbreak had been higher.
Dr Mills reiterated that immunisation was the best protection against a potentially serious disease.
"Unfortunately there has been very low measles immunisation coverage in much of Northland until the last few years. This means that many children and young adults are susceptible to measles," she said.
"This is an avoidable disease where there is an effective vaccine. Immunisation protects not only the individual, but also stops the spread of this disease within our communities and protects our most vulnerable - infants and people who are immune-compromised, such as those on cancer treatment.
"Please double check that your child is not at risk. There is a window of opportunity now, while cases are limited to one part of Northland, to catch up on any missed vaccinations. Vaccination is a much better option than having a very sick child at home for a couple of weeks."
She recommended that the first MMR vaccine be given at 12 months while measles was present in the community. A second MMR could be given a month later, to ensure maximal protection.
Unimmunised people who had had contact with a person with measles would normally be advised to stay at home and away from all public places, including school or work, for 14 days after contact.
Anyone born before 1969 or who had received two doses of MMR could reasonably assume that they were immune.
"Measles is spread by tiny droplets in the air and is very infectious, easily spreading to those nearby," she added.
"The first symptoms [fever, cough, runny nose and red eyes] can be mistaken for a cold, with the rash appearing on the face and neck and spreading over the body three to five days later."
Anyone displaying symptoms of measles should telephone their doctor or Healthline (0800 611-116) without delay.