Jacinda Ardern has downplayed the risk to trans-Tasman travellers after the revelation of a positive COVID-19 case within Brisbane Airport.
On Friday, Queensland health authorities revealed a man from Papua New Guinea had tested positive after spending time in the airport.
Under the COVID-19 travel arrangements, people from higher risk countries like PNG are supposed to stay in 'red zone' areas of international airports.
However, the man and his companion were taken to the 'green zone' area designated for trans-Tasman bubble travellers to NZ.
The pair spent two hours in the same area as 390 people bound for Auckland and Christchurch on Air New Zealand and Qantas flights on Thursday morning.
After considering the situation, NZ health authorities decided not to order any travellers to isolate.
"The Ministry of Health is continuing to advise passengers who flew from Brisbane to New Zealand last night to monitor their health," the health ministry advised.
"If symptoms develop, call Healthline and get a test."
Speaking from Opotiki in the Bay of Plenty, the New Zealand prime minister suggested onward transmission was unlikely.
"At this stage officials consider it to present a relatively low risk to travellers," Ms Ardern said.
She said the case showed why officials on both sides of the Tasman need to be vigilant to stop the bubble from popping.
"We had to put a lot of work into the arrangements," she said.
"From time to time, we are going to have to manage situations where there may be lapses.
"(We have to) continue to ensure (the rules) are applied, that we have rigour around them, and how careful everyone continues to work."