A case of measles has been confirmed in Northland this week.
Northland District Health Board has reported an unimmunised child came in contact with children from the Waikato and contracted the disease.
Northland DHB medical officer of health Clair Mills said a family with measles travelled from the Waikato to Northland, against medical advice.
"Measles is highly-infectious and if children are not immunised there is a very high chance they will get sick if exposed to someone with measles."
Dr Mills advised Northlanders to ensure their families are protected from measles.