Seven young people on an Emirates flight to Auckland now have measles. One had to be admitted to hospital and more cases are likely.
Flight EK434 came from Brisbane on 11 January.
The Auckland Regional Public Health Service issued a warning at the weekend about the possibility of passengers being infected.
It says all the confirmed cases are young people aged from five to 16 years old.
The Medical Officer of Health says there are likely to be more cases.
Dr Richard Hoskins says the initial infection came from a family group on the flight. Measles have been confirmed in a second family, with the possibility of a third also being infected.
Dr Hoskins says they have a list of likely contacts and are tracking them, but more cases are still likely.
Those exposed to measles have travelled to various parts of the North Island.