An Air New Zealand crew member who tested positive for COVID-19 was vaccinated days earlier.
Speaking with TVNZ's Breakfast on Monday, Prime Minister Jacinda Ardern said the flight attendant was recently vaccinated but it takes around a fortnight for it to work.
"The person had only just been vaccinated, so they were a priority for this exact reason," she told TVNZ.
"The issue being, of course, that the vaccine takes a couple of weeks to work at this point it wasn't quite doing its job and nor would we have expected it to, but it does demonstrate this person was indeed a priority for us."
The crew member was one of 9000 border workers who were first in line to be inoculated against the virus.
The Prime Minister said genome sequencing results are expected in the next 24 hours and the Ministry of Health is considering whether there is a need for harsher restrictions on international crew.
The crew member tested positive on Sunday after routine surveillance testing.
They returned to Auckland from Tokyo, Japan on February 28 on flight NZ90 and returned a negative COVID-19 result. They have been moved to Auckland's quarantine facility.
There is currently one location of interest - the Auckland Airport Countdown on March 3 between 12:07pm and 1:22pm.
Anyone who was at the store at this time is asked to monitor their health for the next 10 days, which is until March 17.
If people who visited this supermarket begin to feel unwell, they should contact Healthline on 0800 358 5454, get tested, and stay at home until a negative test result is received. A list of testing centres in Auckland is available here.
There is also one health appointment currently being assessed. Everyone who was at the clinic at the same time is being identified and will be contacted and provided specific health advice.
Dr Ben Johnston, Air New Zealand's chief medical officer, confirmed the positive case was among its air crew.
"There are significant precautions in place for our crew operating to international destinations set out by the Ministry of Health, and we are confident that our people are following the protocols diligently," he says.
"For Japan these include taking private transport to and from their hotel, isolating in the hotel while on layover and wearing PPE while travelling to and from the hotel, through the airport and on board. Aircrew are also subject to regular surveillance testing where they are tested up to once every seven days."