The World Health Organisation said on its website that a second New Zealand case had been confirmed.
The Director-General of Health Dr Ashley Bloomfield said the citizen is a woman in her 30s who had recently returned from a trip to Italy.
The positive test result was formally reported to the ministry at about 6pm yesterday. At that point, health authorities began notifying the woman and her family and started the process of contact tracing.
The woman returned on an Air New Zealand flight NZ0283, from Singapore to Auckland on 25 February.