Health authorities are warning of a confirmed measles case on a flight from Kuala Lumpur.

A passenger on Malaysia Airlines flight MH131 was infectious when it arrived in Auckland on the 26th of February.

Dr Julia Peters of the Auckland Regional Public Health Service says anyone onboard may have been exposed.

"If they do develop any symptoms of measles then they really need to call their general practitioner or Healthline for advice."

Dr Peters says it's important people call their doctor, as they don't want infectious patients in waiting rooms.