New Zealand's confirmed cases of Influenza A/H1N1 rose to 12 on Friday, the Health Ministry said, Xinhua reported.
The new case was a passenger who arrived from Los Angeles on Air New Zealand flight NZ5 on May 31, said deputy director of public health Fran McGrath.
The person and close contacts were in isolation at home and being treated with Tamiflu.
The new case followed notification on Wednesday night of a person who arrived in New Zealand on May 30 on Air NZ flight NZ5, and had been confirmed as having Influenza A/H1N1.
New Zealand's confirmed Influenza A/H1N1 cases were stable at 10 until this week. Health officials are warning that cases are likely to increase given the huge rise of cases in Australia.
An advertising campaign is due to start on Saturday in newspapers and on radio, airport posters and billboards to remind people about the flu and how to limit its spread.
The cumulative total of probable cases in New Zealand is now 11, up from 10 on Thursday.
There are currently 58 suspected cases, down from 66 on Thursday. There are 66 people in isolation or quarantine and being treated with Tamiflu.
More than 100 people have died from the flu worldwide, and 19, 273 cases have been reported in 66 countries.