A measles alert has been issued after a child with the disease arrived in Auckland on 30 January on a flight from Vietnam and later flew to Wellington.
As it's less than 15 months old, the child is too young to have been immunised against the highly infectious disease.
The Singapore Airlines flight left Ho Chi Minh City for Auckland via Singapore on 29 January.
Wellington medical officer of health Dr Annette Nesdale says people could have been exposed to the disease on the flight, or a later one to Wellington that day.
The child was taken to the emergency department at Wellington hospital early on 1 February and on the evening of 3 February.
It was also seen at Karori Medical Centre on 2, 3 and 4 February.
Dr Nesdale says symptoms of measles include fever, tiredness, runny nose, a cough and sore red eyes. They could start appearing from Monday onwards.
People who may have been exposed can ring Regional Public Health, 04 570 9007, to speak to the on-call public health nurse.