A sick traveller from Auckland carried the disease to Samoa, where seven measles cases have been confirmed.
There are also 169 suspected cases in Samoa, including one that lead to the death of an infant.
And in Tonga, a measles outbreak was declared yesterday after members of a school rugby team contracted the virus on a trip to New Zealand.
Sixty-eight cases have been confirmed in Tonga.
New Zealand has to help its Pacific neighbours tackle the disease, the MP Shane Reti said.