A measles alert has heightened concerns about New Zealand's immunisation rates, especially in vulnerable regions such as Northland. 

A Northland student contracted the disease after attending a high school drama competition in Wellington.

There are now 11 exposure events related to the student - all of which are listed on the Te Whatu Ora website - with those considered close contacts required to isolate for seven days if they are not immunised..

The Chief Medical Officer for Te Aka Whai Ora Māori Health Authority Dr Rawiri McKree Jansen spoke to Charlotte Cook.