Canterbury Distrist Health Board is warning travellers who flew on a Pacific Blue flight from Melbourne last week they may have been exposed to measles.
One passenger on the flight, which arrived into Christchurch at 3pm on Monday 31 January, had been infected with the disease.
The DHB is advising anyone who was sitting in rows 25 to 29, or any passenger from the flight who feels unwell, to contact their doctor immediately.
