A measles alert has been issued by health officials in Auckland.
An international passenger who arrived in the city on 31 October on a Qantas flight has been diagnosed with English measles, prompting the alert.
Medical Officer of Health Sheryl Jury says immunisation means measles infection is rare in Auckland - but it could spread rapidly in groups that are not immunised.
Dr Jury says any travellers on Qantas flight QF 043 that day, or their family members, who have symptoms suggestive of measles should immediately seek advice from a doctor.
Typical symptoms are initial fever, runny nose and sore eyes, followed by a red blotchy rash.
Measles can also sometimes cause pneumonia and inflammation of the brain.