A toddler and a woman in her forties are the latest to be diagnosed with Measles in Canterbury.

The number of Cantabrians diagnosed in the past week is now up to seven.

Canterbury DHB medical officer of health Ramon Pink says it's highly contagious and people showing symptoms should isolate themselves.

He says this means staying home from work and having no contact with un-immunised people.

The first four people infected with measles were un-immunised.